Documentation: Describe the non-prefixed "Device:*" variables.
Documentation: Describe the non-prefixed "Device:*" variables.

These are the ones that people should use in build steps and such.

Task-number: QTCREATORBUG-14614
Change-Id: I398ee57a0338c16f41dd190abe3fc9b055a50132
Reviewed-by: hjk <4622a3e4640ee19ab4ebad197849e45b7170d50c@theqtcompany.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@theqtcompany.com>
Reviewed-by: Leena Miettinen <885fda02d52616fec24ed5fed9b3f0568fce3ead@theqtcompany.com>

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