Upgrade/Install: Improve the accuracy of the auto_update_{$type} filter docblock.

This updates the filter documentation for `auto_update_{$type}` to account for the changes to default auto-update behaviors made in WordPress 5.6.

Starting in WordPress 5.6, all new installs auto-update major versions by default.

Props felipeloureirosantos, audrasjb, marybaum, davidbaumwald.
Fixes #53330.
Built from https://develop.svn.wordpress.org/trunk@52214


git-svn-id: http://core.svn.wordpress.org/trunk@51806 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-automatic-updater.php

@@ -193,9 +193,10 @@ class WP_Automatic_Updater {
 		 *  - `auto_update_theme`
 		 *  - `auto_update_translation`
 		 *
-		 * Generally speaking, plugins, themes, and major core versions are not updated
-		 * by default, while translations and minor and development versions for core
-		 * are updated by default.
+		 * Since WordPress 3.7, minor and development versions of core, and translations have
+		 * been auto-updated by default. New installs on WordPress 5.6 or higher will also
+		 * auto-update major versions by default. Starting in 5.6, older sites can opt-in to
+		 * major version auto-updates, and auto-updates for plugins and themes.
 		 *
 		 * See the {@see 'allow_dev_auto_core_updates'}, {@see 'allow_minor_auto_core_updates'},
 		 * and {@see 'allow_major_auto_core_updates'} filters for a more straightforward way to

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52213';
+$wp_version = '5.9-alpha-52214';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.