Incorrect example code in 'Create a dataset' docs
### Describe the bug

On [this](https://huggingface.co/docs/datasets/create_dataset) page, the example code for loading in images and audio is incorrect.

Currently, examples are:

``` python
from datasets import ImageFolder
dataset = load_dataset("imagefolder", data_dir="/path/to/pokemon")
```
and 
``` python
from datasets import AudioFolder
dataset = load_dataset("audiofolder", data_dir="/path/to/folder")
```

I'm pretty sure the imports are wrong and should be:

``` python 
from datasets import load_dataset
dataset = load_dataset("audiofolder", data_dir="/path/to/folder")
```

I am happy to update this if this is right but just wanted to check before making any changes.

### Steps to reproduce the bug

Go to https://huggingface.co/docs/datasets/create_dataset

### Expected behavior

N/A

### Environment info

N/A