Comment out SSH ciphers and other crypto algorithms from config.yml.example

The merge request [1] removed the hardcoding of algorithms from gitlab-sshd, but the defaults in the example config file did not change, leading to the same warnings about algorithms not being post-quantum secure from OpenSSH 10.1 clients as before the hardcoding got removed, when removed as is.

Also update the lists of algorithms to what is currently documented [2], so that if commented out, the defaults can be used as a baseline.

[1] !1315 (merged) [2] https://docs.gitlab.com/administration/operations/gitlab_sshd/#configure-ssh-algorithms