add missing TopBar Height documentation  (#6986)
add missing TopBar Height documentation  (#6986)

Add missing documentation about `TopBarOptions.height`, stating about android only, and on iOS referring to `largeTitle` Option.

Closes #6983 
wix/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation