Fix a number of broken links in the docs (#9758)

As reported by pylinkvalidate.py script

Author: browniebroke

docs/api-guide/schemas.md

@@ -392,7 +392,7 @@ introspection.
 
 #### `get_operation_id()`
 
-There must be a unique [operationid](openapi-operationid) for each operation.
+There must be a unique [operationid][openapi-operationid] for each operation.
 By default the `operationId` is deduced from the model name, serializer name or
 view name. The operationId looks like "listItems", "retrieveItem",
 "updateItem", etc. The `operationId` is camelCase by convention.

docs/community/3.1-announcement.md

@@ -46,7 +46,7 @@ The cursor based pagination renders a more simple style of control:
 
 The pagination API was previously only able to alter the pagination style in the body of the response. The API now supports being able to write pagination information in response headers, making it possible to use pagination schemes that use the `Link` or `Content-Range` headers.
 
-For more information, see the [custom pagination styles](../api-guide/pagination/#custom-pagination-styles) documentation.
+For more information, see the [custom pagination styles](../api-guide/pagination.md#custom-pagination-styles) documentation.
 
 ---
 

docs/community/3.3-announcement.md

@@ -54,7 +54,7 @@ The `ModelSerializer` and `HyperlinkedModelSerializer` classes should now includ
 
 [forms-api]: ../topics/html-and-forms.md
 [ajax-form]: https://github.com/encode/ajax-form
-[jsonfield]: ../api-guide/fields#jsonfield
+[jsonfield]: ../api-guide/fields.md#jsonfield
 [accept-headers]: ../topics/browser-enhancements.md#url-based-accept-headers
 [method-override]: ../topics/browser-enhancements.md#http-header-based-method-overriding
 [django-supported-versions]: https://www.djangoproject.com/download/#supported-versions

docs/community/3.4-announcement.md

@@ -179,16 +179,16 @@ The full set of itemized release notes [are available here][release-notes].
 [moss]: mozilla-grant.md
 [funding]: funding.md
 [core-api]: https://www.coreapi.org/
-[command-line-client]: api-clients#command-line-client
-[client-library]: api-clients#python-client-library
+[command-line-client]: https://github.com/encode/django-rest-framework/blob/3.4.7/docs/topics/api-clients.md#command-line-client
+[client-library]: https://github.com/encode/django-rest-framework/blob/3.4.7/docs/topics/api-clients.md#python-client-library
 [core-json]: https://www.coreapi.org/specification/encoding/#core-json-encoding
 [swagger]: https://openapis.org/specification
 [hyperschema]: https://json-schema.org/latest/json-schema-hypermedia.html
 [api-blueprint]: https://apiblueprint.org/
-[tut-7]: ../tutorial/7-schemas-and-client-libraries/
-[schema-generation]: ../api-guide/schemas/
+[tut-7]: https://github.com/encode/django-rest-framework/blob/3.4.7/docs/tutorial/7-schemas-and-client-libraries.md
+[schema-generation]: ../api-guide/schemas.md
 [api-clients]: https://github.com/encode/django-rest-framework/blob/3.14.0/docs/topics/api-clients.md
 [milestone]: https://github.com/encode/django-rest-framework/milestone/35
-[release-notes]: release-notes#34
-[metadata]: ../api-guide/metadata/#custom-metadata-classes
+[release-notes]: ./release-notes.md#34x-series
+[metadata]: ../api-guide/metadata.md#custom-metadata-classes
 [gh3751]: https://github.com/encode/django-rest-framework/issues/3751

docs/community/3.5-announcement.md

@@ -254,9 +254,9 @@ in version 3.3 and raised a deprecation warning in 3.4. Its usage is now mandato
 [funding]: funding.md
 [uploads]: https://core-api.github.io/python-client/api-guide/utils/#file
 [downloads]: https://core-api.github.io/python-client/api-guide/codecs/#downloadcodec
-[schema-generation-api]: ../api-guide/schemas/#schemagenerator
-[schema-docs]: ../api-guide/schemas/#schemas-as-documentation
-[schema-view]: ../api-guide/schemas/#the-get_schema_view-shortcut
+[schema-generation-api]: ../api-guide/schemas.md#schemagenerator
+[schema-docs]: ../api-guide/schemas.md#schemas-as-documentation
+[schema-view]: ../api-guide/schemas.md#get_schema_view
 [django-rest-raml]: https://github.com/encode/django-rest-raml
 [raml-image]: ../img/raml.png
 [raml-codec]: https://github.com/core-api/python-raml-codec

docs/community/third-party-packages.md

@@ -177,7 +177,7 @@ To submit new content, [create a pull request][drf-create-pr].
 [drf-create-pr]: https://github.com/encode/django-rest-framework/compare
 [authentication]: ../api-guide/authentication.md
 [permissions]: ../api-guide/permissions.md
-[third-party-packages]: ../topics/third-party-packages/#existing-third-party-packages
+[third-party-packages]: #existing-third-party-packages
 [discussion-group]: https://groups.google.com/forum/#!forum/django-rest-framework
 [djangorestframework-digestauth]: https://github.com/juanriaza/django-rest-framework-digestauth
 [django-oauth-toolkit]: https://github.com/evonove/django-oauth-toolkit