Docs: babel-preset-react-app opts of @babel/plugin-transform-runtime

Created by: aixfox

There are opts not contained in babel-preset-react-app document, which work effectively in packages/babel-preset-react-app/create.js

requested review from @root

requested review from @root

requested review from @root

requested review from @root

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added CLA Signed label

Created by: facebook-github-bot

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

Created by: stale[bot]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

added stale label

added tag: documentation label

removed stale label

restored source branch github/fork/aixfox/master