git format-patch -s enhancement

hi all

git format-patch -s is sub-optimal : it appends the SoB, which falls after the snips --- changelog ... that the commit message may contain

So it misfires on any maintainer scripts expecting the SoB above the 1st snip.

The workaround is manual SoBs above any snips.

I note this in -s doc,

           Add a Signed-off-by trailer to the commit message, using
the committer identity of yourself.
           See the signoff option in git-commit(1) for more information.

"trailer" is really "document current working behavior" (normative docu-speak, so to speak;)

Ideal behavior is to find 1st in-body --- snip and insert there