am d642f829: am 54dee349: docs: Fixed broken urls in the UI testing training main page and revised intro to the \'Testing UI for a Single App\' class.

* commit 'd642f8297529b3df96d0f822b062cb8354c90c18':
  docs: Fixed broken urls in the UI testing training main page and revised intro to the 'Testing UI for a Single App' class.