code: function lineComment(editor) {
          editor = editor || EditorManager.getFocusedEditor();
          if (!editor) {
              return;
          }
  
          editor.setSelections(editor.document.doMultipleEdits(_getLineCommentEdits(editor, editor.getSelections(), "line")));
      }
docs: Invokes a language-specific line-comment/uncomment handler
  @param {?Editor} editor If unspecified, applies to the currently focused editor