validate_argument_spec: fixed example syntax (#82534)

lib/ansible/modules/validate_argument_spec.py

@@ -74,7 +74,7 @@ EXAMPLES = r'''
 - name: verify vars needed for next include and not from inside it, also with params i'll only define there
   block:
     - ansible.builtin.validate_argument_spec:
-        argument_spec: "{{lookup('ansible.builtin.file', 'nakedoptions.yml'}}"
+        argument_spec: "{{ lookup('ansible.builtin.file', 'nakedoptions.yml') }}"
         provided_arguments:
           but: "that i can define on the include itself, like in it's `vars:` keyword"