style: fix overload and cli autocomplete

jina/serve/executors/__init__.py

@@ -1084,7 +1084,7 @@ def serve(
         :param port_monitoring: The port on which the prometheus server is exposed, default is a random port between [49152, 65535]
         :param prefer_platform: The preferred target Docker platform. (e.g. "linux/amd64", "linux/arm64")
         :param protocol: Communication protocol of the server exposed by the Executor. This can be a single value or a list of protocols, depending on your chosen Gateway. Choose the convenient protocols from: ['GRPC', 'HTTP', 'WEBSOCKET'].
-        :param provider: If set, Executor is translated to a custom container compatible with the chosen provider. Choose the convenient providers from: ['NONE', 'SAGEMAKER'].
+        :param provider: If set, Executor is translated to a custom container compatible with the chosen provider. Choose the convenient providers from: ['NONE', 'SAGEMAKER', 'GCP'].
         :param py_modules: The customized python modules need to be imported before loading the executor
 
           Note that the recommended way is to only import a single module - a simple python file, if your