generate-cmdlist.sh: avoid selecting synopsis at wrong place
In "common" man pages there is luckily no "NAME" anywhere except at beginning of documents. If there is another "NAME", sed could mis-select it and lead to common-cmds.h corruption. So better nail it at beginning of line, which would reduce corruption chance.
Signed-off-by: Nguyễn Thái Ngọc Duy <email@example.com> Signed-off-by: Junio C Hamano <firstname.lastname@example.org>