Update filtering.rst

Author: firaskafri

docs/filtering.rst

@@ -3,7 +3,7 @@ Filtering
 
 Graphene integrates with
 `django-filter <https://django-filter.readthedocs.io/en/stable/>`__ to provide filtering of results.
-See the `usage documentation <https://django-filter.readthedocs.io/en/main/guide/usage.html#the-filter>`__
+See the `usage documentation <https://django-filter.readthedocs.io/en/stable/guide/usage.html#the-filter>`__
 for details on the format for ``filter_fields``.
 
 This filtering is automatically available when implementing a ``relay.Node``.