Update ScrollView.maintainVisibleContentPosition to reflect Android support

[maxoumime]

This PR updates the documentation to reflect the (pending) changes on ScrollView.maintainVisibleContentPosition, which now works for Android and is not iOS specific anymore.

Related PR on the react-native repo: facebook/react-native#29466

I don't know what the process should be since this PR is related to another one on a different repository, so I'm creating this PR as a draft and I will open it once the PR gets merged on the react-native repository.

[react-native-bot]

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Changes to docs/ are reflected in the next "master" version.

Thank you for your contributions.

_{How to Contribute • Documentation Sources}

[react-native-bot]

Deploy preview for react-native ready!

Built with commit 37c4a1f0fbf96b838fc4ff61a26fa40ddf67e301

https://deploy-preview-2088--react-native.netlify.app

Changes to docs/ are reflected in the next "master" version.

Thank you for your contributions.

_{How to Contribute • Documentation Sources}