docs: clarify MergeIterator heap rationale and ouroboros usage#149
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Improves the documentation for the "Merge Iterator" chapter:
For MergeIterator, the explanation for using a binary heap is made more heuristic, linking it to the problem of merging
nsorted sequences. This provides better intuition for the choice.Add reference for the
ouroboroscrate, closes Give references about self_referencing in 1.2 Merge Iterator #109