About: Fix grammar typo with pluralization.

Props metodiew, westonruter.
Amends [42121].
See #42087.
Fixes #42476 for trunk.

Built from https://develop.svn.wordpress.org/trunk@42159


git-svn-id: http://core.svn.wordpress.org/trunk@41990 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/about.php

@@ -211,7 +211,7 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 					<p><?php _e( 'WordPress 4.9 includes an upgraded version of MediaElement.js, which removes dependencies on jQuery, improves accessibility, modernizes the UI, and fixes many bugs.' ); ?></p>
 				</div>
 				<div class="col">
-					<h3><a href="https://make.wordpress.org/core/2017/10/15/improvements-for-roles-and-capabilities-in-4-9/"><?php _e( 'Roles and Capability Improvements' ); ?></a></h3>
+					<h3><a href="https://make.wordpress.org/core/2017/10/15/improvements-for-roles-and-capabilities-in-4-9/"><?php _e( 'Improvements to Roles and Capabilities' ); ?></a></h3>
 					<p><?php _e( 'New capabilities have been introduced that allow granular management of plugins and translation files. In addition, the site switching process in multisite has been fine-tuned to update the available roles and capabilities in a more reliable and coherent way.' ); ?></p>
 				</div>
 			</div>

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42157';
+$wp_version = '5.0-alpha-42159';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.