document segmentApi Add get&update&delete operate (#1285)

Co-authored-by: luowei <glpat-EjySCyNjWiLqAED-YmwM>

api/services/dataset_service.py

@@ -1091,6 +1091,8 @@ class SegmentService:
                     segment.answer = args['answer']
                 if args['keywords']:
                     segment.keywords = args['keywords']
+                if args['enabled'] is not None:
+                    segment.enabled = args['enabled']
                 db.session.add(segment)
                 db.session.commit()
                 # update segment index task