docs/submittingpatches: flesh out "how to nominate" methods

Currently they are buried within the text, making it hard to find.
Move them to the top and be clear what is _not_ a good idea.

v2: Minor commit polish, use only "resending" as suggested by Matt.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
1 file changed