doc: fix unmatched code fences in git-stripspace

The asciidoctor renderer is more picky than classic asciidoc, and insists that the start and end of a code fence be the same size. Found with this hacky perl script: foreach my $fn (@ARGV) { open(my $fh, '<', $fn); my ($fence, $fence_lineno, $prev); while (<$fh>) { chomp; if (/^----+$/) { if ($fence_lineno) { if ($_ ne $fence) { print "$fn:$fence_lineno:mismatched fence: ", length($fence), " != ", length($_), "\n"; } $fence_lineno = undef; } # hacky check to avoid title-underlining elsif ($prev eq '' || $prev eq '+') { $fence = $_; $fence_lineno = $.; } } $prev = $_; } } Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>