util/manibuilder/README.md: Fix typo

Change-Id: I68d3055d0d6b80b79673f66769663387fe15dcde
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/51518
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed