fixed a typo

src/routes/guilds/#guild_id/vanity-url.ts

@@ -10,7 +10,7 @@ router.get("/", async (req: Request, res: Response) => {
 	const guild = await GuildModel.findOne({ id: guild_id }).exec();
 	if (!guild.vanity_url) throw new HTTPError("This guild has no vanity url", 204);
 
-	return res.json({ vanity_ur: guild.vanity_url });
+	return res.json({ vanity_url: guild.vanity_url });
 });
 
 export default router;