Fix link to an explanation of @raw_response_type usage (#4435)

Summary:
Time to fix TODO in DOCs 😎

Pull Request resolved: #4435

Reviewed By: captbaritone

Differential Revision: D48973735

Pulled By: alunyov

fbshipit-source-id: 30a51492649c6d65aa20e5275616340571a6e4ab

website/docs/glossary/glossary.md

@@ -672,8 +672,7 @@ Compare to [fragment resource](#fragment-resource).
 
 A directive added to queries which tells Relay to generate types that cover the `optimisticResponse` parameter to `commitMutation`.
 
-<!-- TODO fix this link -->
-See the [documentation](../guided-tour/updating-data/local-data-updates) for more.
+See the [guided tour on updating data](../guided-tour/updating-data/graphql-mutations/#optimistic-response) for more.
 
 ## Reader