Site Health: Improve the wording for `UTF8MB4` test description.

Props garrett-eclipse, chetan200891, johnjamesjacoby, ayeshrajans.
Fixes #48044.
Built from https://develop.svn.wordpress.org/trunk@46402


git-svn-id: http://core.svn.wordpress.org/trunk@46201 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-site-health.php

@@ -1119,7 +1119,7 @@ class WP_Site_Health {
 			),
 			'description' => sprintf(
 				'<p>%s</p>',
-				__( 'UTF8MB4 is a database storage attribute that makes sure your site can store non-English text and other strings (for instance emoticons) without unexpected problems.' )
+				__( 'UTF8MB4 is the character set WordPress prefers for database storage because it safely supports the widest set of characters and encodings, including Emoji, enabling better support for non-English languages.' )
 			),
 			'actions'     => '',
 			'test'        => 'utf8mb4_support',

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta2-46401';
+$wp_version = '5.3-beta2-46402';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.