Fix the doctest in pyspark.pandas.frame.DataFrame.to_dict (Python 3.12)

File "/__w/spark/spark/python/pyspark/pandas/frame.py", line 2515, in pyspark.pandas.frame.DataFrame.to_dict
Failed example:
    df.to_dict(into=OrderedDict)
Expected:
    OrderedDict([('col1', OrderedDict([('row1', 1), ('row2', 2)])), ('col2', OrderedDict([('row1', 0.5), ('row2', 0.75)]))])
Got:
    OrderedDict({'col1': OrderedDict({'row1': 1, 'row2': 2}), 'col2': OrderedDict({'row1': 0.5, 'row2': 0.75})})