[doc](iceberg) update doc about mapping iceberg uuid type #3231
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morningman
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… conf mapping iceberg uuid (#59406) ### What problem does this PR solve? doc apache/doris-website#3231 1. iceberg uuid type use the conf of enable.varbinary.mapping to control mapping type, default is mapping to string type. 2. as binary type not support used in group by key, so count(distinct binary) will thrown error now, support binary type in multi_distinct_count agg function.
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… conf mapping iceberg uuid (#59406) ### What problem does this PR solve? doc apache/doris-website#3231 1. iceberg uuid type use the conf of enable.varbinary.mapping to control mapping type, default is mapping to string type. 2. as binary type not support used in group by key, so count(distinct binary) will thrown error now, support binary type in multi_distinct_count agg function.
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