Make lookup plugins return lists to fix failures (#15625)

* Make lookup plugins return lists to fix failures

* Update unit tests

* Use lookup for test failures, update docs

* Grammar fix from review

Co-authored-by: Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

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Co-authored-by: Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

awx_collection/plugins/lookup/schedule_rruleset.py

@@ -109,7 +109,7 @@ DOCUMENTATION = """
 EXAMPLES = """
     - name: Create a ruleset for everyday except Sundays
       set_fact:
-        complex_rule: "{{ query(awx.awx.schedule_rruleset, '2022-04-30 10:30:45', rules=rrules, timezone='UTC' ) }}"
+        complex_rule: "{{ lookup(awx.awx.schedule_rruleset, '2022-04-30 10:30:45', rules=rrules, timezone='UTC' ) }}"
       vars:
         rrules:
           - frequency: 'day'
@@ -352,4 +352,4 @@ class LookupModule(LookupBase):
             raise_from(AnsibleError("Failed to parse generated rule set via rruleset {0}".format(e)), e)
 
         # return self.get_rrule(frequency, kwargs)
-        return rruleset_str
+        return [rruleset_str]