Add doc for `APPROX_COUNT_DISTINCT` aggregate function (#20188)#20249

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ti-chi-bot[bot] merged 6 commits intopingcap:release-8.4from ti-chi-bot:cherry-pick-20188-to-release-8.4

Feb 12, 2025

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Update functions-and-operators/aggregate-group-by-functions.md

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Update functions-and-operators/aggregate-group-by-functions.md

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