UserModeLinux-HOWTO.txt: remove ^H characters

If you can't read this patch, please run:

	sed -i -e "s/[^\o10]\o10//g" \
		Documentation/virtual/uml/UserModeLinux-HOWTO.txt

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Richard Weinberger <richard@nod.at>