chore: update wording & add terms link

Author: GamingGeek

content/docs/important/refund.mdx

@@ -7,7 +7,8 @@ icon: BanknoteArrowDown
 <Callout type="error">
   This policy only applies to subscriptions created via Stripe!
   If you purchased Fire+ through Discord, you are subject to Discord's
-  refund policy and any issues with subscriptions must be raised to Discord,
+  [paid service terms](https://discord.com/terms/paid-services-terms) and
+  any issues with subscriptions must be raised to Discord,
   not Fire, as we have no control over these payments
 </Callout>