Merge branch 'id-config-fields-docs' into 'main'

Add docs for grace-period and probes config options

See merge request gitlab-org/gitlab-shell!581

config.yml.example

@@ -78,6 +78,12 @@ sshd:
   web_listen: "localhost:9122"
   # Maximum number of concurrent sessions allowed on a single SSH connection. Defaults to 10.
   concurrent_sessions_limit: 10
+  # The server waits for this time (in seconds) for the ongoing connections to complete before shutting down. Defaults to 10.
+  grace_period: 10
+  # The endpoint that returns 200 OK if the server is ready to receive incoming connections; otherwise, it returns 503 Service Unavailable. Defaults to "/start".
+  readiness_probe: "/start"
+  # The endpoint that returns 200 OK if the server is alive. Defaults to "/health".
+  liveness_probe: "/health"
   # SSH host key files.
   host_key_files:
     - /run/secrets/ssh-hostkeys/ssh_host_rsa_key