Update packages/google-cloud-firestore/google/cloud/firestore_v1/collection.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: daniel-sanche

packages/google-cloud-firestore/google/cloud/firestore_v1/collection.py

@@ -146,7 +146,7 @@ def document(self, document_id: Union[str, None] = None) -> "DocumentReference":
                 uppercase and lowercase and letters.
 
         Returns:
-            :class:`~google.cloud.firestore_v1.document.document.DocumentReference`:
+            :class:~google.cloud.firestore_v1.document.DocumentReference:
             The child document.
         """
         doc = super(CollectionReference, self).document(document_id)