doc: Mention 'sync' after 'dd'.

Suggested by librenoob on #guix.

* doc/guix.texi (USB Stick Installation): Add 'sync' invocation.
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Ludovic Courtès 2017-05-15 22:38:52 +02:00
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@ -7320,6 +7320,7 @@ copy the image with:
@example
dd if=guixsd-usb-install-@value{VERSION}.x86_64 of=/dev/sdX
sync
@end example
Access to @file{/dev/sdX} usually requires root privileges.