Update ruby upgrades doc with manual cluster deploy instructions
- Update ruby upgrades doc with manual cluster deploy instructions
- Took out mentions of
NEXT_RUBY_VERSION
as it's set by default in the respective repositories, and we no longer need to specify it during the upgrade.
Part of gitlab-com/gl-infra/delivery#20547 (closed) and gitlab-com/gl-infra/delivery#20557 (closed)
Edited by Jenny Kim