Help/About: Update the About page for WordPress 5.9.1.

Props hellofromTonya, audrasjb.
Fixes #55173.

Built from https://develop.svn.wordpress.org/trunk@52783


git-svn-id: http://core.svn.wordpress.org/trunk@52372 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/about.php

@@ -39,6 +39,37 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 			</nav>
 		</div>
 
+		<div class="about__section changelog">
+			<div class="column">
+				<h2><?php _e( 'Maintenance Release' ); ?></h2>
+				<p>
+					<?php
+					printf(
+						/* translators: 1: WordPress version number, 2: plural number of bugs. */
+						_n(
+							'<strong>Version %1$s</strong> addressed %2$s bug.',
+							'<strong>Version %1$s</strong> addressed %2$s bugs.',
+							82
+						),
+						'5.9.1',
+						number_format_i18n( 82 )
+					);
+					?>
+					<?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( '5.9.1' )
+						)
+					);
+					?>
+				</p>
+			</div>
+		</div>
+
 		<hr class="is-large" />
 
 		<div class="about__section">

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52781';
+$wp_version = '6.0-alpha-52783';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.