fix(docs): Fix incorrect style in TabNavigator sample (#734)
fix(docs): Fix incorrect style in TabNavigator sample (#734)

The example provides styling for the tab icon via the `icon` property in the styles object. However in the example, it is used as `tabIcon` which does not exist.
Steviey/win-react-navigation,half-shell/react-navigation,half-shell/react-navigation,Steviey/win-react-navigation,Steviey/win-react-navigation,half-shell/react-navigation