Default TextInput autoCapitalize to sentences on Android
Default TextInput autoCapitalize to sentences on Android

Summary:
Currently `TextInput.autoCapitalize` is defaulting to 'none' on Android.  This PR sets the default to 'sentences', to match iOS and the PropTypes documentation.

Fixes #14846
Closes https://github.com/facebook/react-native/pull/14853

Differential Revision: D5918196

Pulled By: shergin

fbshipit-source-id: d0d00e75d44a410c6821b4ff8910099aae2b2c7c

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