docs: improve versioning documentation (#9017)

docs/usage/modules/versioning.md

lib/manager/ansible/readme.md

lib/manager/bazel/readme.md

lib/manager/buildkite/readme.md

lib/manager/circleci/readme.md

lib/manager/cloudbuild/readme.md

lib/manager/docker-compose/readme.md

lib/manager/dockerfile/readme.md

lib/manager/droneci/readme.md

lib/manager/gitlabci/readme.md

lib/manager/helm-requirements/readme.md

lib/manager/helm-values/readme.md

lib/manager/helmfile/readme.md

lib/manager/helmv3/readme.md

lib/manager/kubernetes/readme.md

lib/manager/terraform/readme.md