Yes the documentation has been updated for the next release. iTunes in not an option for up-to-date systems. I have used the following and had no problems.
Ian
Using Xcode to Test an iOS App
To test your iOS IPA file using Xcode , do the following:
Launch Xcode and select Window Ø Devices and Simulators .
Connect an iPhone or iPad to the Mac using a cable and unlock the device.
On the Mac, iTunes may launch and show a dialog asking “Do you want to allow this computer to access information…” Click on the Cancel button.
Note: This feature can be turned off in iTunes. Select iTunes Ø Preferences… , select the Devices tab, and click on the Prevent iPods, iPhone, and iPad from syncing automatically checkbox.
On the device, it may prompt to Trust This Computer . Tap on the Trust button. This may require to enter the Passcode to trust this computer. The device will show up in the Xcode Devices window.
The first time the device is connected to the Mac, Xcode will take some time to Prepare debugger support. This may take some time. Please wait.
In the Xcode Devices window, there will be a section named INSTALLED APPS . Click on the + button.
Find the IPA file to add. Click Open after you have selected it.
Click the Install button next to the name of the app.
Wait until the Mac installs the app to your device.
After the install is complete, you will see the app icon on your device and you can test it.