Help/About: Fix typo and remove trailing spaces from some strings.

Props mukesh27, casiepa, davidbaumwald.
Merges [48809] to the 5.5 branch.
Fixes #51028.
Built from https://develop.svn.wordpress.org/branches/5.5@48932


git-svn-id: http://core.svn.wordpress.org/branches/5.5@48694 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/about.php

@@ -66,7 +66,7 @@
 				<h2><?php _e( 'Speed' ); ?></h2>
 				<p><strong><?php _e( 'Posts and pages feel faster, thanks to lazy-loaded images.' ); ?></strong></p>
 				<p><?php _e( 'Images give your story a lot of impact, but they can sometimes make your site seem slow.' ); ?></p>
-				<p><?php _e( 'In WordPress 5.5, images wait to load until they’re just about to scroll into view. The technical term is ‘lazy loading.’' ); ?></p>
+				<p><?php _e( 'In WordPress 5.5, images wait to load until they’re just about to scroll into view. The technical term is ‘lazy loading’.' ); ?></p>
 				<p><?php _e( 'On mobile, lazy loading can also keep browsers from loading files meant for other devices. That can save your readers money on data — and help preserve battery life.' ); ?></p>
 			</div>
 		</div>
@@ -75,7 +75,7 @@
 			<div class="column">
 				<h2><?php _ex( 'Search', 'sitemap' ); ?></h2>
 				<p><strong><?php _e( 'Say hello to your new sitemap.' ); ?></strong></p>
-				<p><?php _e( 'WordPress sites work well with search engines. ' ); ?></p>
+				<p><?php _e( 'WordPress sites work well with search engines.' ); ?></p>
 				<p><?php _e( 'Now, by default, WordPress 5.5 includes an XML sitemap that helps search engines discover your most important pages from the very minute you go live.' ); ?></p>
 				<p><?php _e( 'So more people will find your site sooner, giving you more time to engage, retain and convert them to subscribers, customers or whatever fits your definition of success.' ); ?></p>
 			</div>
@@ -149,7 +149,7 @@
 		<div class="about__section has-1-column">
 			<div class="column">
 				<h2><?php _e( 'Accessibility' ); ?></h2>
-				<p><?php _e( 'Every release adds improvements to the accessible publishing experience, and that remains true for WordPress 5.5. ' ); ?></p>
+				<p><?php _e( 'Every release adds improvements to the accessible publishing experience, and that remains true for WordPress 5.5.' ); ?></p>
 				<p><?php _e( 'Now you can copy links in media screens and modal dialogs with a button, instead of trying to highlight a line of text.' ); ?></p>
 				<p><?php _e( 'You can also move meta boxes with the keyboard, and edit images in WordPress with your assistive device, as it can read you the instructions in the image editor.' ); ?></p>
 			</div>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5.1-RC2-48928';
+$wp_version = '5.5.1-RC2-48932';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.