STYLE: use "items" instead od "item"

Alex

Source/cmListCommand.h

@@ -79,9 +79,9 @@ public:
       "INSERT will insert elements to the list to the specified location.\n"
       "When specifying an index, negative value corresponds to index from the"
       " end of the list.\n"
-      "REMOVE_AT and REMOVE_ITEM will remove item from the list. The "
+      "REMOVE_AT and REMOVE_ITEM will remove items from the list. The "
       "difference is that REMOVE_ITEM will remove the given items, while "
-      "REMOVE_AT will remove the item at the given indices.\n"
+      "REMOVE_AT will remove the items at the given indices.\n"
       ;
     }