Recommend Balena Etcher for creating bootable disks

[Pirate Praveen <praveen@onenetbeyond.org>]

Hi,

At https://www.debian.org/CD/faq/#write-usb I think Balena Etcher [1] 
should be recommended either replacing win32diskmanager or in addition 
to it. This is very easy to use and also works on Mac OS.

[1] https://www.balena.io/etcher/

Thanks
Praveen

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