refactor: concise wording

Co-authored-by: Souji <[email protected]>

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

@@ -17,9 +17,8 @@ const { token } = require('./config.json');
 const client = new Client({ intents: [GatewayIntentBits.Guilds] });
 
 // When the client is ready, run this code (only once)
-// We use 'readyClient' for the event parameter to keep it separate from the already defined 'client'
-// This is important for TypeScript developers as the parameter will be a client that is ready
-// with some properties being non-nullable
+// 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 => {
 	console.log(`Ready! Logged in as ${readyClient.user.tag}`);
 });