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

* Allow to pass options as lookup options.

* Adjust tests.

* Fix non-matching defaults.

(cherry picked from commit a978bff2c7)

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/cloud/univention/udm_group.py

@@ -45,11 +45,13 @@ options:
             - define the whole ldap position of the group, e.g.
               C(cn=g123m-1A,cn=classes,cn=schueler,cn=groups,ou=schule,dc=example,dc=com).
         type: str
+        default: ''
     ou:
         required: false
         description:
             - LDAP OU, e.g. school for LDAP OU C(ou=school,dc=example,dc=com).
         type: str
+        default: ''
     subpath:
         required: false
         description: