chore(Docs): Cleanup testing/e2e.md
chore(Docs): Cleanup testing/e2e.md

PiperOrigin-RevId: 201567557

angulardart/angular,matanlurey/angular,chalin/angular2,matanlurey/angular,angulardart/angular,chalin/angular2,angulardart/angular,chalin/angular2,matanlurey/angular