Fix task tags in dataset cards (#4830)

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

README.md

@@ -16,13 +16,13 @@ size_categories:
 source_datasets:
 - original
 task_categories:
-- text-to-tabular
+- other-text-to-tabular
 - text-retrieval
-- text-to-structured
+- other-text-to-structured
 task_ids:
 - entity-linking-retrieval
 - fact-checking-retrieval
-- relation-extraction
+- other-relation-extraction
 paperswithcode_id: nell
 pretty_name: Never Ending Language Learning (NELL)
 configs: