docs: Revise upgrade versions in update readme
What does this MR do?
Some revisions to the docs around upgrade paths.
We document the importance to stop at 12.0 in other places, but it's definitely worth repeating.
Changed language to emphasise that these paths shouldn't be considered optional.
Upgrade path from 10.x missed a step. Added another link to the paths docs.
Related issues
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Follow the Documentation Guidelines and Style Guide. -
If applicable, update the permissions table. -
Link docs to and from the higher-level index page, plus other related docs where helpful. -
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