fixed queue client type declaration (#13224)

Author: tasherif-msft

sdk/storage/azure-storage-queue/azure/storage/queue/_queue_client.py

@@ -158,7 +158,7 @@ def from_connection_string(
             credential=None,  # type: Any
             **kwargs  # type: Any
         ):
-        # type: (...) -> None
+        # type: (...) -> QueueClient
         """Create QueueClient from a Connection String.
 
         :param str conn_str: