[Buildroot] [PATCHv2] docs/manual: add the "mark as superseded" hint

[Peter Korsgaard]

>>>>> "Vicente" == Vicente Olivert Riera <Vincent.Riera at imgtec.com> writes:

 > Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
 > Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
 > ---
 > Changes v1 -> v2:
 >   - Specify that an account in patchwork is needed (Suggested by Arnout)

Committed, thanks.

-- 
Bye, Peter Korsgaard