revscoring_model: fix typo in error msg

Change-Id: I2546e9ed0d19d5b24afdb4d3849299fc28a9cb37

revscoring_model/model_servers/model_servers.py

@@ -158,7 +158,7 @@ async def preprocess(self, inputs: Dict, headers: Dict[str, str] = None) -> Dict
         """Use MW API session and Revscoring API to extract feature values
         of edit text based on its revision id"""
         if self.LOG_JSON_PAYLOAD:
-            logging.info(f"JSON paylod for the request: {inputs}")
+            logging.info(f"JSON payload for the request: {inputs}")
         inputs = validate_json_input(inputs)
 
         rev_id = self.get_rev_id(inputs, self.EVENT_KEY)