Merge branch 'jc/submittingpatches'

Streamline the document and update with a few e-mail addresses the
patches should be sent to.

* jc/submittingpatches:
SubmittingPatches: give list and maintainer addresses
SubmittingPatches: remove overlong checklist
SubmittingPatches: mention subsystems with dedicated repositories
SubmittingPatches: who am I and who cares?

diff --cc Documentation/SubmittingPatches
Simple merge