xFSTK sources got a new home under Edison Firmware Group on GitHub [1].
Update Intel Edison documentation accordingly.
While here, fix couple of typos.
[1]: https://github.com/edison-fw
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
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