Merge "Revert "Refine documentation for Process.setThreadPriority"" am: fe6160ab9c am: 1cb565ec3c am: 017adb4085 am: 765dbc6b67

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440031

Change-Id: If918ed3b7a64bd8e9e3421d4cee2dc82d08117eb