fix graphiql docs for hapi

[Hoishin]

TODO:

• Update CHANGELOG.md with your change (include reference to issue & this PR) (Don't think it's necessary?)
• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass

[apollo-cla]

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[unicodeveloper]

Hey @Hoishin Thanks for the PR. Please, can you rebase?

[Hoishin]

@unicodeveloper I think I did what I'm supposed to do but I'm not 100% sure.