add note about formats to readme, remove dataset_infos.json

README.md

@@ -116,14 +116,21 @@ automation. This dataset is generated by applying forced alignment on crowd-sour
 audio to produce per-word timing estimates for extraction.
 All alignments are included in the dataset.
 
+Data is provided in two formats: `wav` (16KHz) and `opus` (48KHz). To download a specific format pass it to the `format`
+argument (default format is `wav`):
+
+```python
+ds = load_dataset("datasets/ml_spoken_words", languages="tt", format="opus")
+```
+
 ### Supported Tasks and Leaderboards
 
 Keyword spotting, Spoken term search
 
 ### Languages
 
-The dataset is multilingual. To specify several languages to downloading pass a list of them to the
-`language` argument:
+The dataset is multilingual. To specify several languages to download pass a list of them to the
+`languages` argument:
 
 ```python
 ds = load_dataset("datasets/ml_spoken_words", languages=["ar", "tt", "br"])