Fix marketplace listing links on tech spec page

[vepatel]

Describe the bug

• Update and fix https://docs.nginx.com/nginx-ingress-controller/technical-specifications/#images-with-nginx-plus with Azure and GCP listings for NIC, NIC+WAF and NIC+DoS

[github-actions]

Hi @vepatel 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!