eslint: remove no longer needed comment

jsdocs were added, remove old comment which no longer applies.

react/features/welcome/components/WelcomePage.web.js

         );
     }
 
-/* eslint-disable require-jsdoc */
-
     /**
      * Renders the header part of this WelcomePage.
      *
      * @returns {ReactElement|null}
      */
     _renderHeader() {
-
-/* eslint-enable require-jsdoc */
         const { t } = this.props;
 
         return (