Update admin_manual/configuration_server/caching_configuration.rst

Co-authored-by: Joas Schilling <213943+nickvergessen@users.noreply.github.com>
Signed-off-by: Martin <31348196+Earl0fPudding@users.noreply.github.com>

Author: Earl0fPudding

admin_manual/configuration_server/caching_configuration.rst

@@ -378,7 +378,7 @@ current user. You may use the ``'cache_path'`` directive in ``config.php``
 (See :doc:`config_sample_php_parameters`) to select a different location.
 
 Cache Key Prefix for Redis or Memcached
----------------------------------
+---------------------------------------
 
 By default, Nextcloud generates a semi-unique prefix for cache keys using information like instance ID, version etc. to mitigate the problem of
 collisions when using the same cache for multiple Nextcloud instances.