fix small typo in a comment

panel/widgets/tables.py

@@ -1214,7 +1214,7 @@ def _process_data(self, data):
         # _processed data is already filtered, this made the comparison between
         # the new data and old data wrong. This extension replicates the
         # front-end filtering - if need be - to be able to correctly make the
-        # comparison and update the data hold by the backend.
+        # comparison and update the data held by the backend.
 
         # It also makes a copy of the value dataframe, to use it to obtain
         # the old value in a table-edit event.