I realized we didn't have this in the contributor docs. Noone will read
it, but at least we'll have something to point to for future contributors.
Cc: kernelkind <kernelkind@gmail.com>
Signed-off-by: William Casarin <jb55@jb55.com>
This adds a section on creating patch changelogs when submitting
patches. It helps reviewers know what changed between many different
versions of a patch