[Python] Fixed docstrings in api.mustache (#6391)

* [Python] Fixed docstrings

Fixes swagger-api/swagger-codegen#9630

* Updated generated files

* Fixed python-experimental

* Updated generated files

* Fully fixed the format of the docstrings

* Updated generated files

* Updated generated files in openapi3

Author: Ark-kun

.generator/templates/api.mustache

@@ -38,6 +38,7 @@ class {{classname}}(object):
 {{/notes}}
         This method makes a synchronous HTTP request by default. To make an
         asynchronous HTTP request, please pass async_req=True
+
 {{#sortParamsByRequiredFlag}}
         >>> thread = api.{{operationId}}({{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}async_req=True)
 {{/sortParamsByRequiredFlag}}
@@ -46,20 +47,24 @@ class {{classname}}(object):
 {{/sortParamsByRequiredFlag}}
         >>> result = thread.get()
 
-        :param async_req bool: execute request asynchronously
 {{#allParams}}
-        :param {{dataType}} {{paramName}}:{{#description}} {{{description}}}{{/description}}{{#required}} (required){{/required}}{{#optional}}(optional){{/optional}}
+        :param {{paramName}}:{{#description}} {{{description}}}{{/description}}{{#required}} (required){{/required}}{{#optional}}(optional){{/optional}}
+        :type {{paramName}}: {{dataType}}{{#optional}}, optional{{/optional}}
 {{/allParams}}
+        :param async_req: Whether to execute the request asynchronously.
+        :type async_req: bool, optional
         :param _preload_content: if False, the urllib3.HTTPResponse object will
                                  be returned without reading/decoding response
                                  data. Default is True.
+        :type _preload_content: bool, optional
         :param _request_timeout: timeout setting for this request. If one
                                  number provided, it will be total request
                                  timeout. It can also be a pair (tuple) of
                                  (connection, read) timeouts.
-        :return: {{#returnType}}{{returnType}}{{/returnType}}{{^returnType}}None{{/returnType}}
+        :return: Returns the result object.
                  If the method is called asynchronously,
                  returns the request thread.
+        :rtype: {{#returnType}}{{returnType}}{{/returnType}}{{^returnType}}None{{/returnType}}
         """
         kwargs['_return_http_data_only'] = True
         return self.{{operationId}}_with_http_info({{#sortParamsByRequiredFlag}}{{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}{{/sortParamsByRequiredFlag}}**kwargs)  # noqa: E501
@@ -72,6 +77,7 @@ class {{classname}}(object):
 {{/notes}}
         This method makes a synchronous HTTP request by default. To make an
         asynchronous HTTP request, please pass async_req=True
+
 {{#sortParamsByRequiredFlag}}
         >>> thread = api.{{operationId}}_with_http_info({{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}async_req=True)
 {{/sortParamsByRequiredFlag}}
@@ -80,22 +86,27 @@ class {{classname}}(object):
 {{/sortParamsByRequiredFlag}}
         >>> result = thread.get()
 
-        :param async_req bool: execute request asynchronously
 {{#allParams}}
-        :param {{dataType}} {{paramName}}:{{#description}} {{{description}}}{{/description}}{{#required}} (required){{/required}}{{#optional}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/optional}}
+        :param {{paramName}}:{{#description}} {{{description}}}{{/description}}{{#required}} (required){{/required}}{{#optional}}(optional){{/optional}}
+        :type {{paramName}}: {{dataType}}{{#optional}}, optional{{/optional}}
 {{/allParams}}
+        :param async_req: Whether to execute the request asynchronously.
+        :type async_req: bool, optional
         :param _return_http_data_only: response data without head status code
                                        and headers
+        :type _return_http_data_only: bool, optional
         :param _preload_content: if False, the urllib3.HTTPResponse object will
                                  be returned without reading/decoding response
                                  data. Default is True.
+        :type _preload_content: bool, optional
         :param _request_timeout: timeout setting for this request. If one
                                  number provided, it will be total request
                                  timeout. It can also be a pair (tuple) of
                                  (connection, read) timeouts.
-        :return: {{#returnType}}tuple({{returnType}}, status_code(int), headers(HTTPHeaderDict)){{/returnType}}{{^returnType}}None{{/returnType}}
+        :return: Returns the result object.
                  If the method is called asynchronously,
                  returns the request thread.
+        :rtype: {{#returnType}}tuple({{returnType}}, status_code(int), headers(HTTPHeaderDict)){{/returnType}}{{^returnType}}None{{/returnType}}
         """
 
         {{#servers.0}}

.generator/templates/model.mustache

@@ -107,7 +107,7 @@ class {{classname}}(object):
 {{/description}}
 
         :param {{name}}: The {{name}} of this {{classname}}.  # noqa: E501
-        :type: {{dataType}}
+        :type {{name}}: {{dataType}}
         """
 {{^isNullable}}
 {{#required}}

.generator/templates/python-experimental/api.mustache

@@ -66,6 +66,7 @@ class {{classname}}(object):
 {{/notes}}
             This method makes a synchronous HTTP request by default. To make an
             asynchronous HTTP request, please pass async_req=True
+
             >>> thread = api.{{operationId}}({{#requiredParams}}{{^defaultValue}}{{paramName}}, {{/defaultValue}}{{/requiredParams}}{{#requiredParams}}{{#defaultValue}}{{paramName}}={{{defaultValue}}}, {{/defaultValue}}{{/requiredParams}}async_req=True)
             >>> result = thread.get()
 

.generator/templates/python-experimental/api_client.mustache

@@ -291,6 +291,7 @@ class ApiClient(object):
             ({str: (bool, str, int, float, date, datetime, str, none_type)},)
         :param _check_type: boolean, whether to check the types of the data
             received from the server
+        :type _check_type: bool
 
         :return: deserialized object.
         """
@@ -350,22 +351,28 @@ class ApiClient(object):
             (float, none_type)
             ([int, none_type],)
             ({str: (bool, str, int, float, date, datetime, str, none_type)},)
-        :param files dict: key -> field name, value -> a list of open file
+        :param files: key -> field name, value -> a list of open file
             objects for `multipart/form-data`.
+        :type files: dict
         :param async_req bool: execute request asynchronously
+        :type async_req: bool, optional
         :param _return_http_data_only: response data without head status code
                                        and headers
+        :type _return_http_data_only: bool, optional
         :param collection_formats: dict of collection formats for path, query,
             header, and post parameters.
+        :type collection_formats: dict, optional
         :param _preload_content: if False, the urllib3.HTTPResponse object will
                                  be returned without reading/decoding response
                                  data. Default is True.
+        :type _preload_content: bool, optional
         :param _request_timeout: timeout setting for this request. If one
                                  number provided, it will be total request
                                  timeout. It can also be a pair (tuple) of
                                  (connection, read) timeouts.
         :param _check_type: boolean describing if the data back from the server
             should have its type checked.
+        :type _check_type: bool, optional
         :return:
             If async_req parameter is True,
             the request will be called asynchronously.
@@ -559,9 +566,9 @@ class ApiClient(object):
         :param headers: Header parameters dict to be updated.
         :param querys: Query parameters tuple list to be updated.
         :param auth_settings: Authentication setting identifiers list.
-        :resource_path: A string representation of the HTTP request resource path.
-        :method: A string representation of the HTTP request method.
-        :body: A object representing the body of the HTTP request.
+        :param resource_path: A string representation of the HTTP request resource path.
+        :param method: A string representation of the HTTP request method.
+        :param body: A object representing the body of the HTTP request.
             The object type is the return value of sanitize_for_serialization().
         """
         if not auth_settings: