fixed typo and added comment
fixed typo and added comment

episodeyang/ui-codemirror,rbw0/ui-codemirror-merge,episodeyang/ui-codemirror,workato/ui-codemirror,angular-ui/ui-codemirror,angular-ui/ui-codemirror,workato/ui-codemirror,rbw0/ui-codemirror-merge,zhaokunfay/ui-codemirror,zhaokunfay/ui-codemirror