There shouldn't be a blank line at the beginning, if there is no
optional in-body "From" line.  There must be a blank line between
the body of the explanation and the beginning of the S-o-b lines.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>