Incorrect check in Security Guide Checklist

In Security Guide checklist (https://docs.openstack.org/security-guide/identity/checklist.html
), user is advised to check whenever /etc/keystone/policy.json file has correct ownership. JSON formatted policy files are deprecated since Keystone 19.0.0 (Wallaby) (https://docs.openstack.org/keystone/latest/configuration/policy.html), so that makes this check useless, as it won't find policy.json file in newer deployments. It should be corrected to policy.yaml file, or should include both checks. Issue exists in Check-Identity-01 and Check-Identity-02 steps.

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [ ] This doc is inaccurate in this way: ______
- [ ] This is a doc addition request.
- [X] I have a fix to the document that I can paste below including example: input and output.

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-----------------------------------
Release: on 2023-09-26 05:17:42
SHA: a9f6c5f8f6dda96d9055f1ccdf8e3e31dc90c9f7
Source: https://opendev.org/openstack/security-doc/src/security-guide/source/identity/checklist.rst
URL: https://docs.openstack.org/security-guide/identity/checklist.html