Explain how to set chunk size for LDAP's clean up checker (#1708)

Explain how to set chunk size for LDAP's clean up checker

Author: juliusknorr

admin_manual/configuration_user/user_auth_ldap_cleanup.rst

@@ -33,7 +33,12 @@ users and your ``ldapUserCleanupInterval`` is 20 minutes, the process will
 examine the first 50 users, then 20 minutes later the next 50 users, and 20 
 minutes later the next 50, and so on.
 
-There are two ``occ`` commands to use for examining a table of users marked as 
+The amount of users to check can be set to a custom value via occ command. The
+following example sets it to 300:
+
+``sudo -u www-data php occ config:app:set --value=300 user_ldap cleanUpJobChunkSize``
+
+There are two ``occ`` commands to use for examining a table of users marked as
 deleted, and then manually deleting them.  The ``occ`` command is in your 
 Nextcloud directory, for example ``/var/www/nextcloud/occ``, and it must be run as 
 your HTTP user. To learn more about ``occ``, see 
@@ -59,6 +64,13 @@ This example shows what the table of users marked as ``deleted`` looks like::
  | aaliyah_kunze   | aaliyah kunze   | aaliyah_kunze    | uid=aaliyah_kunze,ou=people,dc=com   |
  +-----------------+-----------------+------------------+--------------------------------------+
 
+Following flags can be specified additionally:
+
+*--short-date*: formats the dates for ``Last login`` and ``Detected on`` in a short Y-m-d format (e.g. 2019-01-14)
+
+*--json--*: instead of a table, the output is json-encoded. This makes it easy to process the data programmatically.
+
+
 Then you can run ``sudo -u www-data php occ user:delete aaliyah_brown`` to delete 
 user aaliyah_brown. You must use the user's Nextcloud name.