Fix subelements lookup docs example (#44782)

* Fix subelements lookup docs example

* Fix grammar

lib/ansible/plugins/lookup/subelements.py

@@ -72,9 +72,9 @@ EXAMPLES = """
         - "{{ users }}"
         - mysql.hosts
 
-    - name: list groups for user that have them, dont error if they don't
+    - name: list groups for users that have them, don't error if groups key is missing
       debug: var=item
-      with_list: "{{lookup('subelements', users, 'groups', 'skip_missing=True')}}"
+      loop: "{{lookup('subelements', users, 'groups', {'skip_missing': True})}}"
 """
 
 RETURN = """