Add spaces around {{ indicators. (#63125)

##### SUMMARY
The example looked a little less readable by not having spaces after `{{` and before `}}`. This commit should make the examples match [ansible-lint rule 206](https://github.com/ansible/ansible-lint/blob/master/lib/ansiblelint/rules/VariableHasSpacesRule.py)

##### ISSUE TYPE
- Docs Pull Request

+label: docsite_pr

lib/ansible/plugins/lookup/items.py

@@ -24,7 +24,7 @@ DOCUMENTATION = """
 EXAMPLES = """
 - name: "loop through list"
   debug:
-    msg: "An item: {{item}}"
+    msg: "An item: {{ item }}"
   with_items:
     - 1
     - 2
@@ -41,7 +41,7 @@ EXAMPLES = """
 
 - name: "loop through list from a variable"
   debug:
-    msg: "An item: {{item}}"
+    msg: "An item: {{ item }}"
   with_items: "{{ somelist }}"
 
 - name: more complex items to add several users