Add example for per-server forwarding configuration

Author: Timongcraft

docs/velocity/admin/getting-started/forwarding.md

@@ -20,6 +20,16 @@ UUIDs and skins. Velocity supports three forwarding formats:
 It is now possible to configure forwarding individually for each server.
 In general, if you are supporting clients using Minecraft 1.13 and newer only, use Velocity modern forwarding.
 For older versions, consider using BungeeGuard for added security; else you must use BungeeCord forwarding.
+<p>Example:</p>
+
+   ```toml
+   lobby = "127.0.0.1:30066"
+   ```
+   Becomes:
+
+   ```toml
+   lobby = { address = "127.0.0.1:30066", forwarding-mode = "MODERN" }
+   ```
 
 :::