fixed hidden warnings from extra tests - batch 2 (#10027)

* fixed hidden warnings from extra tests - batch 2

* remove multiple yaml doc markers from EXAMPLE blocks

* Apply suggestions from code review

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

* Apply suggestions from code review

* Apply suggestions from code review

* dig: adjust markup for return suboptions

* Update plugins/lookup/dig.py

---------

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

plugins/lookup/cartesian.py

@@ -6,24 +6,24 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-DOCUMENTATION = '''
-    author: Unknown (!UNKNOWN)
-    name: cartesian
-    short_description: returns the cartesian product of lists
+DOCUMENTATION = r"""
+author: Unknown (!UNKNOWN)
+name: cartesian
+short_description: returns the cartesian product of lists
+description:
+  - Takes the input lists and returns a list that represents the product of the input lists.
+  - It is clearer with an example, it turns [1, 2, 3], [a, b] into [1, a], [1, b], [2, a], [2, b], [3, a], [3, b].
+  - You can see the exact syntax in the examples section.
+options:
+  _terms:
     description:
-        - Takes the input lists and returns a list that represents the product of the input lists.
-        - It is clearer with an example, it turns [1, 2, 3], [a, b] into [1, a], [1, b], [2, a], [2, b], [3, a], [3, b].
-         You can see the exact syntax in the examples section.
-    options:
-      _terms:
-        description:
-          - a set of lists
-        type: list
-        elements: list
-        required: true
-'''
+      - A set of lists.
+    type: list
+    elements: list
+    required: true
+"""
 
-EXAMPLES = """
+EXAMPLES = r"""
 - name: Example of the change in the description
   ansible.builtin.debug:
     msg: "{{ lookup('community.general.cartesian', [1,2,3], [a, b])}}"
@@ -34,15 +34,15 @@ EXAMPLES = """
   with_community.general.cartesian:
     - "{{list1}}"
     - "{{list2}}"
-    - [1,2,3,4,5,6]
+    - [1, 2, 3, 4, 5, 6]
 """
 
-RETURN = """
-  _list:
-    description:
-      - list of lists composed of elements of the input lists
-    type: list
-    elements: list
+RETURN = r"""
+_list:
+  description:
+    - List of lists composed of elements of the input lists.
+  type: list
+  elements: list
 """
 
 from itertools import product