Merge pull request #30705 from smithfarm/wip-sp-backporting-2

Merge pull request #30705 from smithfarm/wip-sp-backporting-2

doc: split up SubmittingPatches.rst

Reviewed-by: Sage Weil <sage@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
Reviewed-by: Lenz Grimmer <lgrimmer@suse.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Gregory Farnum <gfarnum@redhat.com>
Reviewed-by: Jan Fajerski <jfajerski@suse.com>
Reviewed-by: Brad Hubbard <bhubbard@redhat.com>
Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Abhishek Lekshmanan <abhishek@suse.com>
Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Sebastian Wagner <swagner@suse.com>
Reviewed-by: Willem Jan Withagen <wjw@digiware.nl>