Update src/annotator/sidebar.js

Co-authored-by: Robert Knight <robertknight@gmail.com>

src/annotator/sidebar.js

@@ -209,7 +209,7 @@ export default class Sidebar {
     this.guest.crossframe.on('closeSidebar', () => this.close());
 
     // Sidebar listens to the `openNotebook` event coming from the sidebar's
-    // iframe and re-publish it via the emitter to the Notebook
+    // iframe and re-publishes it via the emitter to the Notebook
     this.guest.crossframe.on('openNotebook', (
       /** @type {string} */ groupId
     ) => {