Update fragment doc with Codegen Client Preset support

[eddeee888]

This PR updates Apollo fragment masking support doc for Codegen Client Preset.

Related PR with fixes and recommended codegen config to make it work: dotansimha/graphql-code-generator#10268

[apollo-cla]

@eddeee888: 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/

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Latest commit: 08d9cd7

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* (developer-tools)/react/(latest)/data/fragments.mdx

Build ID: ccf5b505a940b6b51d8eb00f

URL: https://www.apollographql.com/docs/deploy-preview/ccf5b505a940b6b51d8eb00f

[jerelmiller]

I'll preapprove it for now. This change looks good. Will get it merged after that version has been released. Thanks so much!