Update relay.md (#852)

Author: staticle

_includes/graphql/relay.md

@@ -2,7 +2,7 @@
 
 The Parse Server GraphQL API follows latest standards currently available for highly-scalable APIs and ambitious front-end projects.
 
-The Parse Open Source Team choose to follow the [GraphQL Server Relay Specification](https://relay.dev/docs/en/graphql-server-specification).
+The Parse Open Source Team choose to follow the [GraphQL Server Relay Specification](https://relay.dev/docs/guides/graphql-server-specification).
 
 Relay is a JavaScript framework for building data-driven React applications powered by GraphQL, designed from the ground up to be easy to use, extensible and, most of all, performant. Relay accomplishes this with static queries and ahead-of-time code generation.