Add SSH_LISTEN_HOST to the config cheatsheet (#7793)

This was missing before, and this commit adds it with the correct
default value and description

Author: ohnx

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -132,6 +132,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `START_SSH_SERVER`: **false**: When enabled, use the built-in SSH server.
 - `SSH_DOMAIN`: **%(DOMAIN)s**: Domain name of this server, used for displayed clone URL.
 - `SSH_PORT`: **22**: SSH port displayed in clone URL.
+- `SSH_LISTEN_HOST`: **0.0.0.0**: Listen address for the built-in SSH server.
 - `SSH_LISTEN_PORT`: **%(SSH\_PORT)s**: Port for the built-in SSH server.
 - `OFFLINE_MODE`: **false**: Disables use of CDN for static files and Gravatar for profile pictures.
 - `DISABLE_ROUTER_LOG`: **false**: Mute printing of the router log.