patchwork-bot: Note which actions are part of "housekeeping"

Expand the --help text slightly to remind users what things the
"housekeeping" option does.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Link: https://lore.kernel.org/r/20211201001126.4106635-2-keescook@chromium.org
1 file changed