Disable spell checking on the GraphQL API page

We cannot make this page compliant with our spell checker at this
time, so we need to disable spell check on this page.

doc/api/graphql/reference/index.md

@@ -24,6 +24,8 @@ Fields that are deprecated are marked with **{warning-solid}**.
 Items (fields, enums, etc) that have been removed according to our [deprecation process](../index.md#deprecation-process) can be found
 in [Removed Items](../removed_items.md).
 
+<!-- vale gitlab.Spelling = NO -->
+
 ## Object types
 
 Object types represent the resources that the GitLab GraphQL API can return.

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

@@ -16,6 +16,8 @@
   Fields that are deprecated are marked with **{warning-solid}**.
   Items (fields, enums, etc) that have been removed according to our [deprecation process](../index.md#deprecation-process) can be found
   in [Removed Items](../removed_items.md).
+
+  <!-- vale gitlab.Spelling = NO -->
 \
 
 :plain