Fix syntax examples of some functions#23212
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array_transform function
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Almost all the datafusion functions uses a consistent format for the
syntax_examplewhich describes the expected signature of the function (that is,func_name(arg1, arg2 [, optional_arg]), apart from some functions with specific syntax, e.g.array_agg(expression [ORDER BY expression])).I'm trying to programmatically parse this syntax and map it to the
argumentuser_docdirective, but some of them weren't following the same pattern.Also properly document the
lambdaparameter ofarray_transform.