Highlight that you can only upgrade one minor release at a time
What does this MR do and why?
In order to prevent avoidable issues like #347019 (closed), this MR adds some warnings to highlight that you can only upgrade one minor release at a time.
Screenshots or screen recordings
Current: https://docs.gitlab.com/ee/update/zero_downtime.html
Review app: http://main-ee-79170.178.62.207.141.nip.io/ee/update/zero_downtime.html
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.