Customize: Show sidebar's description below its name in Customizer Widgets sidebar list.

This is part of an effort to reduce `title` attribute usage in WordPress Admin. This changeset updates the Customizer Widgets sidebar list to show sidebar name and description (as these informations may benefit to everyone), and remove the `title` attribute.

Follow-up to [22439], [27548], [31513], [32991], [50804], [53414], [59675].

Props karlgroves, sabernhardt, mukesh27, joedolson.
Fixes #62836.
See #24766.




git-svn-id: https://develop.svn.wordpress.org/trunk@59676 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-includes/class-wp-customize-widgets.php

@@ -733,7 +733,10 @@ public function enqueue_scripts() {
 				<p class="description">{description}</p>
 				<ul class="widget-area-select">
 					<% _.each( sidebars, function ( sidebar ){ %>
-						<li class="" data-id="<%- sidebar.id %>" title="<%- sidebar.description %>" tabindex="0"><%- sidebar.name %></li>
+						<li class="" data-id="<%- sidebar.id %>" tabindex="0">
+							<div><strong><%- sidebar.name %></strong></div>
+							<div><%- sidebar.description %></div>
+						</li>
 					<% }); %>
 				</ul>
 				<div class="move-widget-actions">