Fix typo in image dataset docs (#7231)

Author: albertvillanova

docs/source/image_dataset.mdx

@@ -2,7 +2,7 @@
 
 There are two methods for creating and sharing an image dataset. This guide will show you how to:
 
-* Create an audio dataset from local files in python with [`Dataset.push_to_hub`]. This is an easy way that requires only a few steps in python.
+* Create an image dataset from local files in python with [`Dataset.push_to_hub`]. This is an easy way that requires only a few steps in python.
 
 * Create an image dataset with `ImageFolder` and some metadata. This is a no-code solution for quickly creating an image dataset with several thousand images.