Update files from the datasets library (from 1.18.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.18.0

README.md

@@ -2,6 +2,7 @@
 languages:
 - en
 paperswithcode_id: openwebtext
+pretty_name: OpenWebText
 ---
 
 # Dataset Card for "openwebtext"
@@ -155,4 +156,4 @@ The data fields are the same among all splits.
 
 ### Contributions
 
-Thanks to [@richarddwang](https://github.com/richarddwang) for adding this dataset.
+Thanks to [@richarddwang](https://github.com/richarddwang) for adding this dataset.