Add onQueryUpdate missing parameters

[capucho]

onQueryUpdate callback requires the result and complete fields. However, those fields are not defined in the callback function in the documentation.

Checklist:

• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[apollo-cla]

@capucho: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[jpvajda]

Thanks for catching this! We appreciate the PR.