fix typo in changes.txt
fix typo in changes.txt

Summary: Ref T671

Test Plan: N/A

Reviewers: yongxing

Reviewed By: yongxing

Maniphest Tasks: T671

Differential Revision: http://phabricator.n.miliao.com/D2443

cherrydocker/minos,linyiqun/minos,zxl200406/minos,linyiqun/minos,linyiqun/minos,XiaoMi/minos,zxl200406/minos,linyiqun/minos,cherrydocker/minos,XiaoMi/minos,XiaoMi/minos,XiaoMi/minos,zhoffice/minos,zhoffice/minos,zhoffice/minos,zhoffice/minos,cherrydocker/minos,zxl200406/minos,cherrydocker/minos,zxl200406/minos