Update release notes about multi data disk public preview (#59192)

Co-authored-by: Isaac Brown <101839405+isaacmbrown@users.noreply.github.com>

Author: pallsama

data/release-notes/enterprise-server/3-19/0.yml

@@ -21,6 +21,8 @@ sections:
         # https://github.com/github/releases/issues/6922
         - |
           `ghe-repl-start` can now be executed without requiring a maintenance window when setting up a new replica, as long as `ghe-repl-setup` is immediately followed by `ghe-config-apply`. [Updated: 2025-12-17]
+        - |
+          You can configure multiple data disks to host MySQL and repository data. This capability is currently in public preview and is applicable only for standalone and high availability topologies. It does not apply to cluster topologies. For more information, see [AUTOTITLE](/admin/monitoring-and-managing-your-instance/multiple-data-disks/configuring-multiple-data-disks). [Updated: 2026-01-19]
 
     - heading: Migrations
       notes:

data/release-notes/enterprise-server/3-19/1.yml

@@ -45,6 +45,8 @@ sections:
       To help large instances run more efficiently, enterprise administrators can more easily opt out of the behavior where GitHub generates a rebase commit every time we check whether a pull request can be merged. This change consolidates prior handling of multiple repository rule variables and backend feature flags.
 
       Now, if an administrator sets the instance's `skip_rebase_commit_generation_from_rebase_merge_settings` configuration variable to `true`, the "Allow rebase merging" option in a repository's pull request settings becomes the source of truth for whether rebase commits are generated when mergeability is checked.
+    - |
+      You can configure multiple data disks to host MySQL and repository data. This capability is currently in public preview and is applicable only for standalone and high availability topologies. It does not apply to cluster topologies. For more information, see [AUTOTITLE](/admin/monitoring-and-managing-your-instance/multiple-data-disks/configuring-multiple-data-disks). [Updated: 2026-01-19]
   known_issues:
     - |
       Upgrading or hotpatching to 3.19.1 may fail on very old nodes that have been continuously upgraded from versions older than 2021 versions (i.e. 2.17). If this issue occurs, you will see log entries prefixed with `invalid secret` in ghe-config.log. If you are running nodes this old, it is recommended not to upgrade to 3.19.1.