statistics: Added note about no TopN collected for unique single columns#21633
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What is changed, added or deleted? (Required)
Added a note that TopN is not collected for single column unique indexes or its corresponding column.
See pingcap/tidb#66236
Which TiDB version(s) do your changes apply to? (Required)
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What is the related PR or file link(s)?
executor: skip TopN collection for single-column unique indexes | tidb-test=pr/2687 tidb#66236
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