docs(udfs): improve udf docstring examples #9079
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UDF arguments need to be Ibis expressions. In the existing docstring examples
for the UDF decorators, it can be unclear that the integers being passed to
add_one
are implicitly converted to Ibis literals.To make it clearer, I've added memtables to all the examples, and used pandas-
and pyarrow-specific functions to the examples.