[Docs] Fixed Indices information breaking changes (#27914)

Author: Stuart Cam

docs/reference/migration/migrate_6_0/rest.asciidoc

@@ -66,9 +66,11 @@ Previously it was possible to execute `GET /_aliases,_mappings` or `GET
 /myindex/_settings,_alias` by separating multiple types of requests with commas
 in order to retrieve multiple types of information about one or more indices.
 This comma-separation for retrieving multiple pieces of information has been
-removed.. `GET /_all` can be used to retrieve all aliases, settings, and
-mappings for all indices. In order to retrieve only the mappings for an index,
-`GET /myindex/_mappings` (or `_aliases`, or `_settings`).
+removed. `GET /_all` can be used to retrieve all aliases, settings, and
+mappings for all indices.
+
+In order to retrieve only the mapping for an index use:
+`GET /myindex/_mapping` (or `_alias` for a list of aliases, or `_settings` for the settings).
 
 ==== Requests to existing endpoints with incorrect HTTP verb now return 405 responses