Fix license metadata: cdla-permissive-1.0

Update dataset card front-matter from license: other to cdla-permissive-1.0 to match the Licensing section and upstream LICENSE. Improves Hub license detection/search; no content changes.

README.md

@@ -1,7 +1,7 @@
 ---
 annotations_creators:
 - crowdsourced
-license: other
+license: cdla-permissive-1.0
 pretty_name: DocLayNet
 size_categories:
 - 10K<n<100K
@@ -162,4 +162,4 @@ License: [CDLA-Permissive-1.0](https://cdla.io/permissive-1-0/)
 
 ### Contributions
 
-Thanks to [@dolfim-ibm](https://github.com/dolfim-ibm), [@cau-git](https://github.com/cau-git) for adding this dataset.
+Thanks to [@dolfim-ibm](https://github.com/dolfim-ibm), [@cau-git](https://github.com/cau-git) for adding this dataset.