Add top-k sort timeseries optimization to the query timeseries README

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    • Priority: Major - P3
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      SERVER-87589 added a timeseries optimization that rewrites $sort + $group with $first/$last accumulators to just a $group stage with top/bottom. We should add a description of this optimization to the query timeseries README.

            Assignee:
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            Reporter:
            Gil Alon
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              Created:
              Updated: