doc: add a note on the implementation detail

[trajano]

Added a note in case people would think that the Button would behave 100% like a native control, but find out it is simply a stylized Touchable https://github.com/facebook/react-native/blob/ef6ad1f2d65639a1d41e05a895ad21ce97192749/Libraries/Components/Button.js#L342-L351

I didn't add the link to the specific source lines as I thought that would be TIM.

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