Editor: fix typo in `css_var` doc update.

Fixes a type in the doc update in [56630].

Props ramonopoly, audrasjb, costdev.
Fixes #59401.

Built from https://develop.svn.wordpress.org/trunk@56640


git-svn-id: http://core.svn.wordpress.org/trunk@56152 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/style-engine/class-wp-style-engine.php

@@ -29,7 +29,7 @@ final class WP_Style_Engine {
 	/**
 	 * Style definitions that contain the instructions to parse/output valid Gutenberg styles from a block's attributes.
 	 *
-	 * For every style definition, the follow properties are valid:
+	 * For every style definition, the following properties are valid:
 	 *
 	 *  - classnames    => (array) an array of classnames to be returned for block styles. The key is a classname or pattern.
 	 *                    A value of `true` means the classname should be applied always. Otherwise, a valid CSS property (string)

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56639';
+$wp_version = '6.4-alpha-56640';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.