tweak doc

Author: DanielYang59

pymatgen/io/lobster/inputs.py

@@ -151,7 +151,7 @@ def __setitem__(self, key: str, val: Any) -> None:
         Also clean the keys and values by stripping white spaces.
 
         Raises:
-            KeyError: if parameter is not available.
+            KeyError: if keyword is not available.
         """
         key = key.strip().lower()