Minor fix to dartdoc
Minor fix to dartdoc

dart-lang/sdk,dart-archive/dart2js_info,dart-lang/dart2js_info,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart2js_info,dart-lang/sdk,dart-lang/dart2js_info,dart-lang/sdk