Format field comments also as docstrings

Closes #303

Author: michaelosthege

src/betterproto/plugin/models.py

@@ -147,11 +147,7 @@ def get_comment(
                 sci_loc.leading_comments.strip().replace("\n", ""), width=79 - indent
             )
 
-            if path[-2] == 2 and path[-4] != 6:
-                # This is a field
-                return f"{pad}# " + f"\n{pad}# ".join(lines)
-            else:
-                # This is a message, enum, service, or method
+            # This is a field, message, enum, service, or method
                 if len(lines) == 1 and len(lines[0]) < 79 - indent - 6:
                     lines[0] = lines[0].strip('"')
                     return f'{pad}"""{lines[0]}"""'

src/betterproto/templates/template.py.j2

@@ -45,10 +45,10 @@ class {{ message.py_name }}(betterproto.Message):
 
     {% endif %}
     {% for field in message.fields %}
+    {{ field.get_field_string() }}
         {% if field.comment %}
 {{ field.comment }}
         {% endif %}
-    {{ field.get_field_string() }}
     {% endfor %}
     {% if not message.fields %}
     pass