Update examples to Gitlab::Database::Migration[2.0]

Kerri Millerrequested to merge
kerrizor-master-patch-92532 into master

What does this MR do and why?

A mismatch in acceptable versions here has lead to test failures in a Community contribution, so updating to the latest version to avoid any further cut-n-paste errors. There's undoubtedly other code examples that could be similarly updated.

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