[HWORKS-888] Improve documentation for gRPC support (logicalclocks#219)

Author: javierdlrm

python/hsml/deployment.py

@@ -440,6 +440,7 @@ def creator(self):
 
     @property
     def api_protocol(self):
+        """API protocol enabled in the deployment (e.g., HTTP or GRPC)."""
         return self._predictor.api_protocol
 
     @api_protocol.setter