Note that "scratch" is an accepted image name
Note that "scratch" is an accepted image name

Note that "scratch" is an option in the usage text for "from"'s --image
flag.

Signed-off-by: Nalin Dahyabhai <f562fcb2a0b898bf0be1afc867ea92325d8f825f@redhat.com>

rhatdan/buildah,nalind/buildah-1,projectatomic/buildah,nalind/buildah-1,TomSweeneyRedHat/buildah,nalind/buildah-1,TomSweeneyRedHat/buildah,projectatomic/buildah,nalind/buildah,ipbabble/buildah,rhatdan/buildah,projectatomic/buildah,ipbabble/buildah,nalind/buildah,TomSweeneyRedHat/buildah,rhatdan/buildah