graphql: Make pages.sr.ht API link more useful

This makes it match the other API links, which go to specific pages.

Signed-off-by: Noelle Leigh <noelle_leigh@fastmail.com>

graphql.md

@@ -19,7 +19,7 @@ conventions](api-conventions.md).
 - [hg.sr.ht](/hg.sr.ht/graphql.md)
 - [lists.sr.ht](/lists.sr.ht/graphql.md)
 - [meta.sr.ht](/meta.sr.ht/graphql.md)
-- [pages.sr.ht](https://srht.site)
+- [pages.sr.ht](https://srht.site/graphql)
 - [todo.sr.ht](/todo.sr.ht/graphql.md)
 
 # GraphQL playground