Fastly improvements

[Kemi-Elizabeth]

Priority

3 - Not urgent - can be addressed as team bandwidth permits

Where should the changes be made?

https://fixed.docs.upsun.com/domains/cdn/managed-fastly.html
https://fixed.docs.upsun.com/security/web-application-firewall/fastly-waf.html

What exactly should be updated?

Enhance sections with new additional context and information

Optional: Additional context

No response