Document how to find default NGINX ciphers
Document a clear way for administrators to find out the default NGINX ciphers in the documentation.
This stems from reviewing !2693 (closed) and not wanting to block it from being merged.
Implementation Guide
Edit https://docs.gitlab.com/omnibus/settings/ssl/index.html#use-custom-ssl-ciphers and add a link to the default cipher used.
Edited by Achilleas Pipinellis