update comment in proto file

Author: Mike Prosser

protos/ni/pythonpanel/v1/python_panel_service.proto

@@ -34,7 +34,6 @@ service PythonPanelService {
   // Get a value for a control on the panel
   // Status Codes for errors:
   // - INVALID_ARGUMENT: The specified identifier contains invalid characters. Only alphanumeric characters and underscores are allowed.
-  // - NOT_FOUND: The value with the specified identifier was not found
   rpc GetValue(GetValueRequest) returns (GetValueResponse);
 
   // Set a value for a control on the panel