Update users.py (#544)

Fix the docstring - should match
https://auth0.com/docs/api/management/v2/users/get-enrollments

auth0/management/users.py

@@ -377,7 +377,7 @@ def regenerate_recovery_code(self, user_id: str) -> dict[str, Any]:
         return self.client.post(url)
 
     def get_guardian_enrollments(self, user_id: str) -> dict[str, Any]:
-        """Retrieves all Guardian enrollments.
+        """Retrieve the first confirmed Guardian enrollment for a user.
 
         Args:
             user_id (str):  The user_id of the user to retrieve.