Update Screen-Tracking.md (#545)
Update Screen-Tracking.md (#545)

* Update Screen-Tracking.md

updated names in the onNavigationStateChange example function

* Update Screen-Tracking.md

Steviey/win-react-navigation,Steviey/win-react-navigation,Steviey/win-react-navigation,half-shell/react-navigation,half-shell/react-navigation,half-shell/react-navigation