Add step 5 on maintainers process: Merging.
What does this MR do?
Feedback from gitlab-com/gl-infra/delivery#2886 (comment 1382513054). Clarifies maintainers should merge the bug fixes into the stable branches in the new patch release process.
Feedback from gitlab-com/gl-infra/delivery#2886 (comment 1382513054). Clarifies maintainers should merge the bug fixes into the stable branches in the new patch release process.