Fixed doc string typo in _validate_jti() function (#1064)

Author: kuldeepkhatke

jwt/api_jwt.py

@@ -436,7 +436,7 @@ def _validate_sub(
 
     def _validate_jti(self, payload: dict[str, Any]) -> None:
         """
-        Checks whether "jti" if in the payload is valid ot not
+        Checks whether "jti" if in the payload is valid or not
         This is an Optional claim
 
         :param payload(dict): The payload which needs to be validated