remove unnesessary code and change type info

packages/app/src/client/services/PageContainer.js

@@ -425,7 +425,7 @@ export default class PageContainer extends Container {
    * update page meta data
    * @param {object} page Page instance
    * @param {object} revision Revision instance
-   * @param {Array[Tag]} tags Array of Tag
+   * @param {String[]} tags Array of Tag
    */
   updatePageMetaData(page, revision, tags) {
 

packages/app/src/components/Page/TagLabels.jsx

@@ -60,11 +60,6 @@ class TagLabels extends React.Component {
       });
       editorContainer.setState({ tags });
       pageContainer.updatePageMetaData(savedPage, savedPage.revision, tags);
-
-      const pageEditor = appContainer.getComponentInstance('PageEditor');
-      const markDown = pageEditor.getMarkdown();
-      pageContainer.setState({ markDown });
-
       toastSuccess('updated tags successfully');
     }
     catch (err) {