doc: Fix trivial spelling mistake in efi-stub.txt
doc: Fix trivial spelling mistake in efi-stub.txt

Signed-off-by: Silvan Jegen <6884669131c73644f5b7b09fdb7e2ebbd4421505@gmail.com>
Signed-off-by: Jiri Kosina <ed58f755cc8caaf10c3e8c731a8b86fb8f13d6cb@suse.cz>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs