Documentation cleanup

Minor cleanups while looking through the current docs as part of gitlab-com/gl-infra/delivery#2143 (closed).

Commits are atomic and may make review easier.

assigned to @rspeicher

@skarbek Could you take a look please?

assigned to @skarbek and unassigned @rspeicher

approved this merge request

@rspeicher I have only one piece of feedback to keep one of the docs consistent with verbiage. Otherwise, LGTM!

assigned to @rspeicher

Setting label groupdelivery based on @rspeicher's group.

added groupdelivery label

added 9 commits

• a6c3c7f2...889bff97 - 2 commits from branch master
• 26e2f66b - Add link for nightly builds
• b69480cd - Add resolution note for recovery from a canceled pipeline
• 0a6f4c18 - Remove "Changing default deployment targets"
• b524eb26 - Remove skeleton auto-deploy-transition document
• 03a05e57 - Make rollbacks runbook the SSOT for rollbacks
• ec648e7e - Remove outdated multi-environment documentation
• 86cc5e12 - Remove outdated traffic-generation docs

Compare with previous version

resolved all threads

mentioned in commit fb5d5dce

merged

mentioned in merge request !423 (merged)