Fix reference link in customcooldown.md

bot/resources/tags/customcooldown.md

@@ -17,4 +17,4 @@ async def on_message(message):
         await message.channel.send("Not ratelimited!")
 ```
 
-`from_cooldown` takes the amount of `update_rate_limit()`s needed to trigger the cooldown, the time in which the cooldown is triggered, and a [`BucketType`](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.discord.ext.commands.BucketType).
+`from_cooldown` takes the amount of `update_rate_limit()`s needed to trigger the cooldown, the time in which the cooldown is triggered, and a [`BucketType`](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.BucketType).