Update README.md for consistency (#3)

- Update README.md for consistency (7f2333974b8f6a742d3de54027d9194418c6b57d)


Co-authored-by: Muhammad Ravi Shulthan Habibi <[email protected]>

README.md

@@ -190,9 +190,9 @@ For each language and relation there are triples, that consists of an object, a
 Each instance has the following fields
 * "uuid": a unique identifier
 * "lineid": a identifier unique to mlama
-* "obj_id": knowledge graph id of the object
+* "obj_uri": knowledge graph id of the object
 * "obj_label": surface form of the object
-* "sub_id": knowledge graph id of the subject
+* "sub_uri": knowledge graph id of the subject
 * "sub_label": surface form of the subject
 * "template": template
 * "language": language code