feat(eslint): fix 2 eslint warnings (#3268)

react/features/base/toolbox/components/AbstractButton.js

@@ -141,8 +141,8 @@ export default class AbstractButton<P: Props, S: *> extends Component<P, S> {
     }
 
     /**
-     * Helper function to be implemented by subclasses, which may return a new
-     * React Element to be appended at the end of the button.
+     * Helper function to be implemented by subclasses, which may return a
+     * new React Element to be appended at the end of the button.
      *
      * @protected
      * @returns {ReactElement|null}

react/features/recording/components/LiveStream/LiveStreamButton.web.js

@@ -58,8 +58,8 @@ class LiveStreamButton extends AbstractLiveStreamButton<Props> {
     }
 
     /**
-     * Helper function to be implemented by subclasses, which returns a React
-     * Element to display (a beta tag) at the end of the button.
+     * Helper function to be implemented by subclasses, which returns
+     * a React Element to display (a beta tag) at the end of the button.
      *
      * @override
      * @protected