fix(developer): add missing deprecations to the changelog of stable23

Signed-off-by: Ferdinand Thiessen <[email protected]>

Author: susnux

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_23.rst

@@ -29,4 +29,12 @@ Updated core libraries
 ``doctrine/dbal``
 *****************
 
-The Doctrine Database Abstraction Layer (dbal) powers Nextcloud's database connection and query builder. In Nextcloud 23 this dependency was updated from 3.0 to 3.1. As a consequence the ``\OC\DB\QueryBuilder\QueryBuilder::getFirstResult`` method now returns ``0`` instead of ``null`` if ``\OC\DB\QueryBuilder\QueryBuilder::setFirstResult`` wasn't called.
+The Doctrine Database Abstraction Layer (dbal) powers Nextcloud's database connection and query builder. In Nextcloud 23 this dependency was updated from 3.0 to 3.1. As a consequence the ``\OC\DB\QueryBuilder\QueryBuilder::getFirstResult`` method now returns ``0`` instead of ``null`` if ``\OC\DB\QueryBuilder\QueryBuilder::setFirstResult`` wasn't called.
+
+Front-end changes
+-----------------
+
+Deprecated APIs
+^^^^^^^^^^^^^^^
+
+* The `OCA.Sharing.ExternalLinkActions` API was deprecated in favor of `OCA.Sharing.ExternalShareAction`.