There is a broken link in this page:

http://doc.qt.io/qt-5/supported-platforms.html

The link in the page does not work, here is exact point to broken link:

See also: Qt for Device Creation: Supported Target Devices and Development Hosts.

When opening the link the following error message is shown:

http://doc.qt.io/QtForDeviceCreation/qtee-supported-platforms.html

404 - Page Not Found.

These are the docs you're looking for, but it seems the article may have moved.
Click here to find your way back, or try searching for your page.

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This page might be the actual page where the link should lead to:

http://doc.qt.io/QtForDeviceCreation/qtdc-supported-platforms.html

Please correct and check what is the actual wanted page where the link should point to.