Summary:
`visible-password` represents a very basic keyboard, typically only
letters and numbers. Backed by InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD,
it is useful for things like password and code entry fields. It can also be more
effective than autoCorrect={false} for disabling autocompletion on some keyboards
(like Gboard).
Note `secureTextEntry` also affects `TYPE_TEXT_VARIATION_*` flags internally, so there
may be some undefined behavior when combining `secureTextEntry` with
`keyboardType="visible-password"`
Also, while here, improve the documentation on TextInput to explicitly enumerate
which keyboardType applies to Android vs. iOS (since this is the first android-specific)
Reviewed By: shergin
Differential Revision: D6005353
fbshipit-source-id: 13af90c96353f714c0e106dd0fde90184a476533
752b68857c