[Python][Docs] Add pyarrow.parquet.filters_to_expression example to the User Guide

[AlenkaF]

Describe the enhancement requested

We could update our User Guide with some information on the usage of filters_to_expression. See:

• Iterating over parquet dataset in batches #47988
• [Python][Docs] Add pyarrow.parquet.filters_to_expression to API reference docs #47989 (comment)

Component(s)

Documentation, Python