Fix task tags in dataset cards (#4830)

Commit from https://github.com/huggingface/datasets/commit/83f695c14507a3a38e9f4d84612cf49e5f50c153

README.md

@@ -17,11 +17,11 @@ source_datasets:
 task_categories:
 - text-generation
 - fill-mask
-- text-scoring
+- text-classification
 task_ids:
 - language-modeling
 - masked-language-modeling
-- text-scoring-other-rating
+- text-scoring
 ---
 
 # Dataset Card for the_pile_openwebtext2