Help/About: Update the About page for 5.3.1.

Props audrasjb, melchoyce.
Fixes #48945.
Built from https://develop.svn.wordpress.org/branches/5.3@46892


git-svn-id: http://core.svn.wordpress.org/branches/5.3@46692 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/about.php

@@ -48,6 +48,39 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 			</nav>
 		</div>
 
+		<div class="about__section changelog">
+			<div class="column">
+				<h2><?php _e( 'Maintenance and Security Releases' ); ?></h2>
+				<p>
+					<?php
+					printf(
+						/* translators: 1: WordPress version number, 2: plural number of bugs. More than one security issue. */
+						_n(
+							'<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug.',
+							'<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bugs.',
+							46
+						),
+						'5.3.1',
+						number_format_i18n( 46 )
+					);
+					?>
+					<?php
+					printf(
+						/* translators: %s: HelpHub URL */
+						__( 'For more information, see <a href="%s">the release notes</a>.' ),
+						sprintf(
+							/* translators: %s: WordPress version */
+							esc_url( __( 'https://wordpress.org/support/wordpress-version/version-%s/' ) ),
+							sanitize_title( '5.3.1' )
+						)
+					);
+					?>
+				</p>
+			</div>
+		</div>
+
+		<hr />
+
 		<div class="about__section is-feature">
 			<p>
 				<?php _e( '5.3 expands and refines the block editor introduced in WordPress 5.0 with a new block, more intuitive interactions, and improved accessibility. New features in the editor increase design freedoms, provide additional layout options and style variations to allow designers complete control over the look of a site. This release also introduces the Twenty Twenty theme giving the user more design flexibility and integration with the block editor. Creating beautiful web pages and advanced layouts has never been easier.' ); ?>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3.1-RC2-46890';
+$wp_version = '5.3.1-RC2-46892';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.