improved docs/api-guide/filtering.md for better understanding (#9795)

Author: journpy

docs/api-guide/filtering.md

@@ -235,7 +235,7 @@ For example:
 
  search_fields = ['=username', '=email']
 
-By default, the search parameter is named `'search'`, but this may be overridden with the `SEARCH_PARAM` setting.
+By default, the search parameter is named `'search'`, but this may be overridden with the `SEARCH_PARAM` setting in the `REST_FRAMEWORK` configuration.
 
 To dynamically change search fields based on request content, it's possible to subclass the `SearchFilter` and override the `get_search_fields()` function. For example, the following subclass will only search on `title` if the query parameter `title_only` is in the request:
 
@@ -257,7 +257,7 @@ The `OrderingFilter` class supports simple query parameter controlled ordering o
 
 ![Ordering Filter](../img/ordering-filter.png)
 
-By default, the query parameter is named `'ordering'`, but this may be overridden with the `ORDERING_PARAM` setting.
+By default, the query parameter is named `'ordering'`, but this may be overridden with the `ORDERING_PARAM` setting in the `REST_FRAMEWORK` configuration.
 
 For example, to order users by username: