Issue #3266004 by quietone, longwave: Update UPDATE.txt for Drupal 10

Author: catch

UPDATE.txt

@@ -4,10 +4,11 @@ CONTENTS OF THIS FILE
  * Introduction
  * Minor and patch version updates
  * Is my site using Composer?
- * Updating code manually
  * Updating code with Composer
+ * Updating code manually
+ * Updating Drupal 9 to Drupal 10
  * Updating Drupal 8 to Drupal 9
- * Updating Drupal 6 or 7 to Drupal 9
+ * Updating Drupal 6 or Drupal 7
 
 
 INTRODUCTION
@@ -46,32 +47,34 @@ UPDATING CODE WITH COMPOSER
 ---------------------------
 
  * Refer to 'Update Drupal core via Composer' for details on using Composer:
-   https://www.drupal.org/docs/8/update/update-drupal-core-via-composer
+   https://www.drupal.org/docs/updating-drupal/updating-drupal-core-via-composer
 
 
 UPDATING CODE MANUALLY
 ----------------------
 
  * Refer to 'Updating the Core Software' for details on updating manually:
-   https://www.drupal.org/docs/8/update/update-core-manually
+   https://www.drupal.org/docs/updating-drupal/updating-drupal-core-manually
 
 
-UPDATING DRUPAL 8 TO DRUPAL 9
------------------------------
+UPDATING DRUPAL 9 TO DRUPAL 10
+------------------------------
 
-    1. Prepare the Drupal 8 site for Drupal 9:
-    https://www.drupal.org/docs/9/how-to-prepare-your-drupal-7-or-8-site-for-drupal-9/upgrading-a-drupal-8-site-to-drupal-9
+ * Refer to 'Upgrading from Drupal 9 to Drupal 10' for details:
+   https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-8-or-later/upgrading-from-drupal-9-to-drupal-10
 
-    2. Update the Drupal 8 codebase to Drupal 9:
-    https://www.drupal.org/docs/8/upgrade/upgrading-between-drupal-8-major-versions-eg-from-drupal-8-to-drupal-9
 
-    3. Navigate to /update.php to initiate the update process.
+UPDATING DRUPAL 8 TO DRUPAL 9
+-----------------------------
 
+ * Refer to 'Upgrading from Drupal 8 to Drupal 9' for details:
+   https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-8-or-later/upgrading-from-drupal-8-to-drupal-9
 
-UPDATING DRUPAL 6 OR 7 TO DRUPAL 9
-----------------------------------
 
- * Updating from a previous major version, such as Drupal 6 or 7, requires
-   importing the old site configuration and content into a new Drupal 9 site.
-   Refer to the 'Migrate Guide' for more details on this process:
-   https://www.drupal.org/upgrade/migrate
+UPDATING DRUPAL 6 OR DRUPAL 7
+-----------------------------
+
+ * Updating Drupal 6 or Drupal 7 requires importing the old site configuration
+   and content into a new Drupal site. Refer to the 'Upgrading from Drupal 6 or
+   Drupal 7' for more details.
+   https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-6-or-drupal-7