docs: Fix payments-plugin link in developer guide (#1368)

docs/content/developer-guide/payment-integrations/index.md

@@ -8,7 +8,7 @@ showtoc: true
 Vendure can support many kinds of payment workflows, such as authorizing and capturing payment in a single step upon checkout or authorizing on checkout and then capturing on fulfillment.
 
 {{< alert "primary" >}}
-For a complete working example of a real payment integration, see the [real-world-vendure Braintree plugin](https://github.com/vendure-ecommerce/real-world-vendure/tree/master/src/plugins/braintree)
+For complete working examples of real payment integrations, see the [payments-plugins](https://github.com/vendure-ecommerce/vendure/tree/master/packages/payments-plugin/src)
 {{< /alert >}}
 
 ## Authorization & Settlement