Merge pull request #13161 from nextcloud/chore/deprecated-oc-helper

chore: add docs for deprecated OC_Helper method

Author: susnux

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_32.rst

@@ -64,6 +64,7 @@ Deprecated APIs
 - ``\OC_Template`` and ``\OCP\Template`` classes are deprecated, please use the new ``\OCP\Template\ITemplateManager`` instead.
 - ``\OC_User::useBackend`` is deprecated, please use ``\OCP\IUserManager::registerBackend`` available since 8.0.0
 - ``\OC_User::clearBackends`` is deprecated, please use ``\OCP\IUserManager::clearBackends`` available since 8.0.0
+- ``\OC_Helper::isReadOnlyConfigEnabled`` is deprecated, please use the ``config_is_read_only`` system config directly.
 
 Removed APIs
 ^^^^^^^^^^^^