docs: fix spawn-portal teleport target to overworld

Author: NonSwag

content/docs/portals/index.mdx

@@ -46,7 +46,7 @@ and requires the permission `portals.command.<subcommand>`:
 /portal create <aqua>spawn-portal</aqua>
 
 <gray># Set the portal to teleport to spawn</gray>
-/portal action <aqua>spawn-portal</aqua> teleport <yellow>minecraft:world</yellow> <green>0 64 0</green> <light_purple>0 0</light_purple>
+/portal action <aqua>spawn-portal</aqua> teleport <yellow>minecraft:overworld</yellow> <green>0 64 0</green> <light_purple>0 0</light_purple>
 
 <gray># Add a cooldown of 30 seconds</gray>
 /portal cooldown <aqua>spawn-portal</aqua> <yellow>30s</yellow>