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Summary: I ran into confusion (#12581) because the docs for TouchableOpacity stated that it doesn't change the view hierarchy, but in fact it does, and the docs are just out of date. - [20 Feb 2015](efae175a8e/Libraries/Components/Touchable/TouchableOpacity.js (L21)) Docs correctly reflected that the component was cloned so didn't affect hierarchy - [25 Jul 2015](725053acfe) Component was changed to being wrapped but docs weren't updated. Went to correct this in the docs and noticed they were a bit inconsistent with each other, so have made them more unified. Each one now clearly warns about: - If it adds a view to the hierarchy, which will affect layout. - If it can only accept a single child. Closes https://github.com/facebook/react-native/pull/12583 Differential Revision: D4619837 Pulled By: ericvicenti fbshipit-source-id: 4d1becd9f290cefcb4548a5ea2878be2d2c315fa