Update api_changes_at_v2.x.md

Author: zhonghong322

doc/api_changes_at_v2.x.md

@@ -1,4 +1,4 @@
-# API Changes at v2.x.x
+# API Changes at v2.x
 This document outlines the key differences in APIs between Android Wrapper v2.x(v2-main branch) and the Android Wrapper v1.x(main branch).
 
 ## 1. Added New interfaces for Android Wrapper v2.x
@@ -120,4 +120,4 @@ This document outlines the key differences in APIs between Android Wrapper v2.x(
 |  PointCloudFilter  |  void setD2CAlignStatus(boolean isAlign)  |
 |  Pipeline  |  CameraParam getCameraParam()  |
 |  Pipeline|  CameraParam getCameraParamWithProfile(int colorWidth, int colorHeight, int depthWidth, int depthHeight)  |
-| Pipeline |  CalibrationParam getCalibrationParam(Config config)  |
+| Pipeline |  CalibrationParam getCalibrationParam(Config config)  |