Docs: Fix typos in `_wp_emoji_list()` description.

See #42505.
Built from https://develop.svn.wordpress.org/trunk@42821


git-svn-id: http://core.svn.wordpress.org/trunk@42651 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/formatting.php

@@ -5653,9 +5653,9 @@ function wp_staticize_emoji_for_email( $mail ) {
 }
 
 /**
- * Returns a arrays of emoji data.
+ * Returns arrays of emoji data.
  *
- * These arrays automatically built from the regex in twemoji.js - if they need to be updated,
+ * These arrays are automatically built from the regex in twemoji.js - if they need to be updated,
  * you should update the regex there, then run the `grunt precommit:emoji` job.
  *
  * @since 4.9.0

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42820';
+$wp_version = '5.0-alpha-42821';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.