add drf-url-filters in third party filtering resources and fixed typo (#4548)

Author: manjitkumar

docs/api-guide/filtering.md

@@ -434,7 +434,7 @@ The [djangorestframework-word-filter][django-rest-framework-word-search-filter]
 
 ## drf-url-filters
 
-[drf-url-filter][drf-url-filter] is a simple Django app to apply filters on drf `ModelViewSet`'s `Queryset` in a clean, simple and configurable way. It also supports validations on incoming query params and their values. A beautiful python package `Voluptouos` is being used for validations on the incoming query parameters. The best part about voluptouos is you can define your own validations as per your query params requirements.
+[drf-url-filter][drf-url-filter] is a simple Django app to apply filters on drf `ModelViewSet`'s `Queryset` in a clean, simple and configurable way. It also supports validations on incoming query params and their values. A beautiful python package `Voluptuous` is being used for validations on the incoming query parameters. The best part about voluptuous is you can define your own validations as per your query params requirements.
 
 [cite]: https://docs.djangoproject.com/en/dev/topics/db/queries/#retrieving-specific-objects-with-filters
 [django-filter]: https://github.com/alex/django-filter

docs/topics/third-party-resources.md

@@ -238,6 +238,7 @@ To submit new content, [open an issue][drf-create-issue] or [create a pull reque
 
 * [djangorestframework-chain][djangorestframework-chain] - Allows arbitrary chaining of both relations and lookup filters.
 * [django-url-filter][django-url-filter] - Allows a safe way to filter data via human-friendly URLs. It is a generic library which is not tied to DRF but it provides easy integration with DRF.
+* [drf-url-filter][drf-url-filter] is a simple Django app to apply filters on drf `ModelViewSet`'s `Queryset` in a clean, simple and configurable way. It also supports validations on incoming query params and their values.
 
 ### Misc
 
@@ -351,6 +352,7 @@ To submit new content, [open an issue][drf-create-issue] or [create a pull reque
 [django-rest-framework-braces]: https://github.com/dealertrack/django-rest-framework-braces
 [dry-rest-permissions]: https://github.com/Helioscene/dry-rest-permissions
 [django-url-filter]: https://github.com/miki725/django-url-filter
+[drf-url-filter]: https://github.com/manjitkumar/drf-url-filters
 [cookiecutter-django-rest]:  https://github.com/agconti/cookiecutter-django-rest
 [drf-haystack]: https://drf-haystack.readthedocs.io/en/latest/
 [django-rest-framework-version-transforms]: https://github.com/mrhwick/django-rest-framework-version-transforms