Merge branch 'fix-speed-up-ssh-docs-for-docker' into 'master'

Update docs for different sshd_config path for Omnibus Docker.

See merge request !2400

doc/administration/operations/speed_up_ssh.md

@@ -36,7 +36,7 @@ sudo chown root:git /opt/gitlab-shell/authorized_keys
 sudo chmod 0650 /opt/gitlab-shell/authorized_keys
 ```
 
-Add the following to `/etc/ssh/sshd_config`:
+Add the following to `/etc/ssh/sshd_config` or to `/assets/sshd_config` if you are using Omnibus Docker:
 
 ```
 AuthorizedKeysCommand /opt/gitlab-shell/authorized_keys %u %k
@@ -69,7 +69,7 @@ This is a brief overview. Please refer to the above instructions for more contex
 
 1. [Rebuild the `authorized_keys` file](../raketasks/maintenance.md#rebuild-authorized_keys-file)
 1. Enable writes to the `authorized_keys` file in Application Settings
-1. Remove the `AuthorizedKeysCommand` lines from `/etc/ssh/sshd_config`
+1. Remove the `AuthorizedKeysCommand` lines from `/etc/ssh/sshd_config` or from `/assets/sshd_config` if you are using Omnibus Docker.
 1. Reload sshd: `sudo service sshd reload`
 1. Remove the `/opt/gitlab-shell/authorized_keys` file