Capture required documentation updates for WAF v5

[shaun-nx]

WAF v5 is supported for NGINX OSS and Plus.
All of our documentation around WAF details that it only works with NGNIX Plus.
This issue was create to help capture all know documents that will need to be updated when we move to WAF v5

### Documents to update
- [x] Update WAF installation guide https://docs.nginx.com/nginx-ingress-controller/installation/integrations/app-protect-waf/installation/
- [x] Update WAF polciy docs https://docs.nginx.com/nginx-ingress-controller/configuration/policy-resource/#waf

[github-actions]

Hi @shaun-nx thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!