Close notice in Greengrass IPC client documentation (#572)

* Close notice in client documentation

Author: bretambrose

awsiot/greengrasscoreipc/__init__.py

@@ -25,7 +25,8 @@ def connect(*,
             lifecycle_handler: Optional[LifecycleHandler]=None,
             timeout: float=10.0) -> GreengrassCoreIPCClient:
     """
-    Creates an IPC client and connects to the GreengrassCoreIPC service.
+    Creates an IPC client and connects to the GreengrassCoreIPC service.  When finished with the client,
+    you must call close() to free the client's native resources.
 
     Args:
         ipc_socket: Path to the Unix domain socket of Greengrass Nucleus, defaults to

awsiot/greengrasscoreipc/client.py

@@ -1340,7 +1340,10 @@ def close(self):  # type: (...) -> concurrent.futures.Future[None]
 
 class GreengrassCoreIPCClient(rpc.Client):
     """
-    Client for the GreengrassCoreIPC service.
+    Client for the GreengrassCoreIPC service.  When finished with the client,
+    you must call close() to free the client's native resources.
+
+
     There is a new V2 client which should be preferred.
     See the GreengrassCoreIPCClientV2 class in the clientv2 subpackage.
 

awsiot/greengrasscoreipc/clientv2.py

@@ -14,7 +14,8 @@
 
 class GreengrassCoreIPCClientV2:
     """
-    V2 client for the GreengrassCoreIPC service.
+    V2 client for the GreengrassCoreIPC service.  When finished with the client,
+    you must call close() to free the client's native resources.
 
     Args:
         client: Connection that this client will use. If you do not provide one, it will be made automatically.