Include the compatible graphql version to incremental delivery docs

[thomaswelton]

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Updated the documentation on incremental delivery to include the specific prerelease version of graphQL that Apollo Server is compatible with for incremental delivery.

The current docs state "As of September 2022...", but a new pre release version was made available in 2023 https://github.com/graphql/graphql-js/releases/tag/v17.0.0-alpha.3 and this appears to contain a breaking change in the incremental payload delivery.

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[trevor-scheer]

@thomaswelton did you confirm that alpha.2 is working? We currently test against a specific canary, maybe we should update those references to alpha.2 as well. i.e. our tests use graphql@17.0.0-alpha.1.canary.pr.3361.04ab27334641e170ce0e05bc927b972991953882

[thomaswelton]

For our test cases Alpha 2 works, we're now using defer in production

[trevor-scheer]

@thomaswelton would you mind updating the couple references in the repo to alpha.2? I can as well if you don't mind me pushing to your branch.

[thomaswelton]

@trevor-scheer Sure done