[I] [Python][Doc] Add import statement to `filters_to_expression` docstring example [arrow]

["chilin0525 (via GitHub)" <gi...@apache.org>]

chilin0525 opened a new issue, #49358:
URL: https://github.com/apache/arrow/issues/49358

   ### Describe the enhancement requested
   
   The docstring example for `pyarrow.parquet.filters_to_expression` calls the function without any import statement. 
   
   https://github.com/apache/arrow/blob/8c27898d36f45ece9b0d114b3d6c6a42d20bde7f/python/pyarrow/parquet/core.py#L149
   
   The example should reflect how users would actually call the function:
   
   ```python
   >>> import pyarrow.parquet as pq
   >>> pq.filters_to_expression([('foo', '==', 'bar')])
   <pyarrow.compute.Expression (foo == "bar")>
   ```
   
   ### Component(s)
   
   Documentation


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