Add currentHeight constant to status bar docs
Summary: This PR is to fix #10561 by adding `currentHeight` to a list of constants for the `StatusBar` component. It also makes it clear that this constant is Android only by also adding a further note to the example use. Closes #10561  Closes https://github.com/facebook/react-native/pull/10675 Differential Revision: D4137353 fbshipit-source-id: 717494fe78f8eb55c55447d6567ec8bcd0be86d3
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