Fix the description of --utf8 and --keep to git-am.
Fix the description of --utf8 and --keep to git-am.

The git-am script actually transform --utf8 and --keep to -u and -k when
sent to git-mailinfo.

Signed-off-by: Nikolai Weibull <7726a546294589d2943cb189595a3e598f32f32d@bitwi.se>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git