docs: Cleanup some leftover > symbols from the migration doc

[skaldebane]

I assume they were accidentally left there because they used to be separate lines each with their own > at the beginning of the line, but whoever collapsed them into one line forgot to remove the extra arrow.

Whatever the case is, this commit removes (probably) all of these leftover > symbols.

[changeset-bot]

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Latest commit: c3ea6b1

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[dummdidumm]

thank you!