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Clarify each_batch docs do not iterate non-unique column

Dylan Griffith requested to merge clarify-not-to-each-batch-over-non-unique-column into master

What does this MR do and why?

This came up recently in !111027 (comment 1332491816)

Previously I was confused by this wording and got the impression that it would just lead to inconsistent batch sizes. Given we know that it can just get stuck in an infinite loop (which is actually documented further down the page already) then the wording "proceed with extra caution" is not as helpful as just telling you not to do it. They can already just read on to the next sections about how they can iterate over non-unique columns.

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