Adjust wiki for ARM BeagleBone Black

[Marcelo Barbosa]

Hey guys,

   I adjusted this documentation in wiki:
https://fedoraproject.org/wiki/Architectures/ARM/F20/Installation#For_the_BeagleBone_Black

   Added this important step to create image of Fedora 20 for BeagleBone
Black board.

Best Regards

firemanxbr
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