Asciidoc uses either one-line or two-line syntax for document/section
titles[1]. The two-line form is used in git-status. Fix a few section
titles in the porcelain v2 section which were inadvertently using
markdown syntax.
[1] http://asciidoc.org/userguide.html#X17
Signed-off-by: Todd Zullinger <tmz@pobox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>