patches: Mention missing Signed-off-by headers in the legend.

[Bernhard Übelacker]

Like the wording in the email the patch author receives.

Signed-off-by: Bernhard Übelacker <bernhardu at vr-web.de>
---
 patches/update | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/patches/update b/patches/update
index a11d17e..a03d8a0 100755
--- a/patches/update
+++ b/patches/update
@@ -67,7 +67,7 @@ my @legend =
  [ "buildfail",  "<ul><li>Syntax error or other compile problem.</li>" .
                  "<li>You forgot to include some changes or new files required for compilation.</li>" .
                  "<li>The patch causes compiler warnings (maintainer mode implies -Werror).</li></ul>" ],
- [ "formatting", "<ul><li>The patch author's full name or email address are incorrect or missing.</li>" .
+ [ "formatting", "<ul><li>The patch author's full name, email address, or Signed-off-by headers are incorrect or missing.</li>" .
                  "<li>Whitespace got mangled in transit.</li>" .
                  "<li>Indentation is messed up (usually from editing with a non-standard tab size).</li>" .
                  "<li>8-bit chars got mangled in transit (usually when sending patches to resource files).</li>" .
-- 
2.1.4