chore: update Velocity shutdown command (#493)

* Update velocity shutdown command docs

* Update docs/velocity/admin/reference/commands.md

Co-authored-by: Matouš Kučera <mk@kcra.me>

---------

Co-authored-by: Matouš Kučera <mk@kcra.me>

Author: 456dev

docs/velocity/admin/reference/commands.md

@@ -62,9 +62,19 @@ If a server name has been provided, Velocity will attempt to connect to the serv
 
 ## `/shutdown`
 
-When executed from the console, this will gracefully shut down the Velocity proxy. All players will
-be disconnected from the proxy and plugins will have a chance to finish up before the proxy shuts
-down. An optional reason can be given, either as JSON or with [MiniMessage Format](https://docs.advntr.dev/minimessage/format.html).
+:::info
+
+This command can only be executed from console.
+
+:::
+
+When run, this will gracefully shut down the Velocity proxy.
+All players will be disconnected from the proxy, and plugins will have a chance to finish up before the proxy shuts down.
+An optional reason can be given, either as JSON or with [MiniMessage Format](https://docs.advntr.dev/minimessage/format.html).
+
+If the provided message starts with `"`, `[`, or `{`, then the message is attempted to be parsed as JSON.
+If this parsing fails, or the message starts with anything else, the message will be parsed as MiniMessage.
+
 
 ## `/glist`