refactor: full stop in previous comment

guide/creating-your-bot/main-file.md

@@ -16,7 +16,7 @@ const { token } = require('./config.json');
 // Create a new client instance
 const client = new Client({ intents: [GatewayIntentBits.Guilds] });
 
-// When the client is ready, run this code (only once)
+// When the client is ready, run this code (only once).
 // The distinction between `client: Client<boolean>` and `readyClient: Client<true>` is important for TypeScript Developers.
 // It makes some properties non-nullable.
 client.once(Events.ClientReady, readyClient => {