feat: Document user agent change

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>

Author: SystemKeeper

admin_manual/release_notes/upgrade_to_33.rst

@@ -21,3 +21,9 @@ Snowflake IDs
 
 This version of Nextcloud ships with `Snowflake IDs <https://en.wikipedia.org/wiki/Snowflake_ID>`_. Those IDs include the creation time of object, a sequence ID and a server ID.
 The server ID should now be configured in your config.php file or using environment variables. See :doc:`../configuration_server/config_sample_php_parameters` for more information.
+
+
+Default user agent for outgoing requests changed
+------------------------------------------------
+
+Starting with this release, the default user agent for requests done by the instance was changed from ``Nextcloud Server Crawler`` to ``Nextcloud-Server-Crawler/X.Y.Z``, where ``X.Y.Z`` is the current server version.

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_33.rst

@@ -75,6 +75,11 @@ In this release support for PHP 8.1 was removed. Follow the steps below to make
 
 3. If you have :ref:`continuous integration <app-ci>` set up, remove PHP 8.1 from the matrices of tests and linters.
 
+Default user agent for outgoing requests changed
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Starting with this release, the default user agent for requests done by the instance was changed from ``Nextcloud Server Crawler`` to ``Nextcloud-Server-Crawler/X.Y.Z``, where ``X.Y.Z`` is the current server version.
+
 Added Events
 ^^^^^^^^^^^^