Merge pull request #11353 from nextcloud/backport/11283/stable28

[stable28] Document adding of OCP\User\Backend\IProvideEnabledStateBackend

Author: come-nc

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_28.rst

@@ -164,6 +164,7 @@ Added APIs
   * WebAssembly compilation and execution in worker threads is not affected by this directive (browsers allow compilation and execution of WebAssembly in worker threads by default)
   * ``OCP\Authentication\Token\IProvider::getToken`` to get a token by its token string id
   * ``OCP\Authentication\Token\IToken`` public interface for tokens returned by the function above. Please use those instead of things from ``OC`` namespace.
+  * ``OCP\User\Backend\IProvideEnabledStateBackend`` for user backends that wants to alter disabled state of users (used by user_ldap to mark remnants as disabled if the option is enabled).
 
 
 Changed APIs