fix(admin-manual): mention app setting for groupware example content

Signed-off-by: Hamza <hamzamahjoubi221@gmail.com>

Author: hamza221

admin_manual/groupware/calendar.rst

@@ -209,6 +209,9 @@ Example event
 .. versionadded:: 32.0.0
 
 When a user logs in for the first time an example event is created in their personal calendar.
+
+This feature is enabled by default and is controlled by the ``create_example_event`` app config.
+
 As an admin, you can disable the creation of the example event.
 It is also possible to replace the default event with a custom one.
 
@@ -218,6 +221,10 @@ To disable the creation of the example event for new users:
 2. Scroll down to the "Example content" section.
 3. Disable the "Add example event ..." setting with the checkbox
 
+It can also be toggled from the command line::
+
+  sudo -E -u www-data php occ config:app:set dav create_example_event --value=no
+
 To replace the built-in default event with a custom one:
 
 1. Navigate to the Groupware settings in the admin settings.

admin_manual/groupware/contacts.rst

@@ -87,12 +87,18 @@ Example contact
 
 When a user logs in for the first time an example contact is created in the user's address book.
 
+This feature is enabled by default and is controlled by the ``enableDefaultContact`` app config.
+
 To disable the example contact feature:
 
 1. Navigate to the Groupware settings in the admin settings.
 2. Scroll down to the "Example content" section.
 3. Disable the "Add example contact ..." setting with the checkbox
 
+It can also be toggled from the command line::
+
+  sudo -E -u www-data php occ config:app:set dav enableDefaultContact --value=no
+
 If you want to set a specific contact that should be created.
 
 4. Press the "Import contact" button.