Fix pandas_audio_methods code snippet (#1829)

Fixed the example code snippet which was incorrectly importing `SFMethods` from `pandas_image_methods` rather than `pandas_audio_methods`.

Author: khdlr

docs/hub/datasets-pandas.md

@@ -167,7 +167,7 @@ Using [pandas-audio-methods](https://github.com/lhoestq/pandas-audio-methods) yo
 
 ```python
 import pandas as pd
-from pandas_image_methods import SFMethods
+from pandas_audio_methods import SFMethods
 
 pd.api.extensions.register_series_accessor("sf")(SFMethods)