Missing heading IDs on memory caching page

[MichaIng]

For some reason the heading IDs (and hence heading link URL fragments) on the memory caching page are currently missing, respectively they are id1, id2 etc, counting up with each heading, instead of expected apcu, redis etc. To compare the expected IDs on other pages, like the one about background jobs: https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/background_jobs_configuration.html#parameters

But I don't see the reason for it in the source. Both h2 headings are defined the same way with a dash line below the heading text:

• https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/configuration_server/caching_configuration.rst
• https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/configuration_server/background_jobs_configuration.rst

[skjnldsv]

Still broken. The built HTML confirms <section id="id1"><h2>APCu and <section id="id2"><h2>Redis instead of id="apcu" and id="redis".

Fix: add explicit RST labels immediately before the APCu and Redis headings in admin_manual/configuration_server/caching_configuration.rst:

.. _apcu:

APCu
----

and

.. _redis:

Redis
-----

This overrides Sphinx's fallback ID generation and restores the expected anchor URLs.