Add Evan and Marcel to docs CODEOWNERS
What does this MR do?
Update the CODEOWNERS file so that @eread and @marcel.amirault can approve docs MRs in the Runner repo.
Why was this MR needed?
Sometimes we help out with docs reviews in this repo, or act as a backup to Suzanne when needed, but aren't able to approve due to the strict codeowners rules (which were fixed in !3018 (merged))