Fix wrong kotlin syntax in kord docs

Author: radstevee

docs/discord/kord.md

@@ -128,7 +128,7 @@ You may then use the annotation:
 ```kotlin
 @CommandScope(guilds = { 1337 })
 @Command("command")
-public suspend void yourCommand() { /* ... */ }
+public suspend fun yourCommand() { /* ... */ }
 ```
 
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