docs(accessibility): document large content viewer support on iOS

[bacarybruno]

This PR adds documentation for the newly added props in https://github.com/facebook/react-native/pull/45903:

• accessibilityShowsLargeContentViewer: whether the large content viewer is shown
• accessibilityLargeContentTitle: title of the large content viewer

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[bacarybruno]

cc @joevilches as you followed the implementation on the react-native repo 🙂🙏