Audio mono argument no longer supported, despite class documentation
I want to solve this problem can you please assign it to me
and also can you please guide whether the mono parameter is required to be re-added or the documentation needs an update?
### Describe the bug

Either update the documentation, or re-introduce the flag (and corresponding logic to convert the audio to mono)

### Steps to reproduce the bug

Audio(sampling_rate=16000, mono=True) raises the error 
TypeError: Audio.__init__() got an unexpected keyword argument 'mono'

However, in the class documentation, is says:
Args:
        sampling_rate (`int`, *optional*):
            Target sampling rate. If `None`, the native sampling rate is used.
        mono (`bool`, defaults to `True`):
            Whether to convert the audio signal to mono by averaging samples across
            channels.
        [...]

### Expected behavior

The above call should either work, or the documentation within the Audio class should be updated

### Environment info

- `datasets` version: 4.0.0
- Platform: Linux-5.15.0-124-generic-x86_64-with-glibc2.35
- Python version: 3.12.11
- `huggingface_hub` version: 0.34.4
- PyArrow version: 21.0.0
- Pandas version: 2.3.2
- `fsspec` version: 2025.3.0