Revert "Fix non-matching defaults in docs (#5446) (#5451)"

This reverts commit b26df2a008.

plugins/modules/cloud/univention/udm_user.py

@@ -169,7 +169,6 @@ options:
         description:
             - List of telephone numbers.
         type: list
-        default: []
     postcode:
         description:
             - Postal code of users business address.
@@ -201,13 +200,11 @@ options:
                join."
         aliases: [ sambaPrivileges ]
         type: list
-        default: []
     samba_user_workstations:
         description:
             - Allow the authentication only on this Microsoft Windows host.
         aliases: [ sambaUserWorkstations ]
         type: list
-        default: []
     sambahome:
         description:
             - Windows home path, e.g. C('\\$FQDN\$USERNAME').