Clarify Upgrade recommendations for Docker
What does this MR do and why?
This MR updates the Upgrade GitLab using Docker Engine instructions to clarify that the GitLab Upgrade recommendations should always be referenced. They should not only be referenced when upgrading between major versions.
The goal of this MR is to prevent folks from proceeding along upgrade paths that do not account for required stops/intermediate versions that occur within a major version.
We note:
8.11.Z -> 8.12.0 -> 8.17.7 -> 9.5.10 -> 10.8.7 -> 11.11.8 -> 12.0.12 -> 12.1.17 -> 12.10.14 -> 13.0.14 -> 13.1.11 -> 13.8.8 -> 13.12.15 -> 14.0.12 -> 14.3.6 -> 14.9.5 -> 14.10.Z -> 15.0.Z -> latest 15.Y.Z
It was possible to go from 10.8.7 to 11.11.8 to 12.0.2. It is not possible to, for example, go from 12.10.14 to 13.12.15 to 14.x.
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