Update playbooks_prompts.rst (#22910)

* Update playbooks_prompts.rst

Clarify prompting only occurs when not in extra_vars

* Update playbooks_prompts.rst

* Update playbooks_prompts.rst

Added non-interactive session clarification.

* Update playbooks_prompts.rst

docs/docsite/rst/playbooks_prompts.rst

@@ -27,6 +27,9 @@ Here is a most basic example::
         - name: "favcolor"
           prompt: "what is your favorite color?"
 
+.. note::
+   Prompts for individual ``vars_prompt`` variables will be skipped for any variable that is already defined through the command line ``--extra-vars`` option, or when running from a non-interactive session (such as cron or Ansible Tower). See :ref:`_passing_variables_on_the_command_line` in the /Variables/ chapter.
+
 If you have a variable that changes infrequently, it might make sense to
 provide a default value that can be overridden.  This can be accomplished using
 the default argument::