Update index.md

Author: DaoD

team/index.md

@@ -23,12 +23,12 @@ nav:
 - Qiannan Zhu, 2021-2023, Beijing Normal University
 
 ###### PhD
-- Kelong Mao, 2021-2025, Alibaba
+- Kelong Mao, 2021-2025, JD.com, Inc.
 - Zhan Su, 2021-2025, Tencent
 - Hongjin Qian, 2020-2024, Beijing Academy of Artificial Intelligence
 - Yujia Zhou, 2019-2024, Tsinghua University
 - Han Zhang, 2018-2023, China Unicom
-- Xubo Qin, 2017-2021, JD
+- Xubo Qin, 2017-2021, Beijing Institute for General Artificial Intelligence
 - Sha Hu, 2010-2015, Southwest University
 
 ###### Master