Fix possessive in the GraphQL page

Fix the underlying HAML that creates the GraphQL reference page so
it doesn't use the possessive form of GitLab.

doc/api/graphql/reference/index.md

@@ -26,7 +26,7 @@ in [Removed Items](../removed_items.md).
 
 ## Object types
 
-Object types represent the resources that GitLab's GraphQL API can return.
+Object types represent the resources that the GitLab GraphQL API can return.
 They contain _fields_. Each field has its own type, which will either be one of the
 basic GraphQL [scalar types](https://graphql.org/learn/schema/#scalar-types)
 (e.g.: `String` or `Boolean`) or other object types.

lib/gitlab/graphql/docs/templates/default.md.haml

@@ -21,7 +21,7 @@
 :plain
   ## Object types
 
-  Object types represent the resources that GitLab's GraphQL API can return.
+  Object types represent the resources that the GitLab GraphQL API can return.
   They contain _fields_. Each field has its own type, which will either be one of the
   basic GraphQL [scalar types](https://graphql.org/learn/schema/#scalar-types)
   (e.g.: `String` or `Boolean`) or other object types.