Improve graphile export docs

[mrjackdavis]

Description

Raising this PR early for visibility. Open to feedback as I go

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Latest commit: 0397c47f8b0b7c0bf516479c225ab25015b30cd5

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[benjie]

Thanks so much for contributing some documentation! Just a heads up that this is an unusually busy time for me: I just came back from vacation yesterday and on Saturday I'll be flying to America for GraphQLConf where I have two unfinished talks to present, so it may take me a few weeks to get around to reviewing it fully. I might do a cursory review before then if I get a chance, but it is likely to take a while to get merged. Sorry!