docs: Add X-Patchwork-* header documentation

Avoids sending people to the code to find out about this stuff. Include
examples using 'git-send-email', which should cover most folks.

Signed-off-by: Stephen Finucane <stephen@that.guru>

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/TODO b/docs/TODO
index 17d8cd1..37c30fd 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -2,7 +2,7 @@
 * Person link should go to -> (person,project) patch list view
 * https for logins
 * Patch flags
-* Help: XML RPC interface, bundling, Hint headers
+* Help: bundling
 * Allow manual update of commit ref
 * store rejected mails
 * In-message From: header