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Update array_functions.md

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docs/en/query_language/functions/array_functions.md
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@ -798,10 +798,7 @@ Converts an array of arrays to a flat array.
Function:
- Applies to any depth of nested arrays, but all the elements must be on the same level.
For example, array `[[[1]], [[2], [3]]]` can be flattened, but array `[[1], [[2], [3]]]` can't.
- Applies to any depth of nested arrays.
- Does not change arrays that are already flat.
The flattened array contains all the elements from all source arrays.