All instructions for v2 should use 2.5.5
All instructions for v3 should use 3.2.8
All instructions for v4 should use 4.0.0(-beta1, depending on timing)

Universal compliance is not mandatory, we'll probably want exceptions for blogs or sections describing changes/additions in specific versions.

Bonus points for finding a way to use a reference so we only need to update a single place in the future - alternatively, we might consider a wildcard for the patch version