small documetation fix and manifest change (#180)

Author: jafu888

constraintlayout/constraintlayout/src/main/java/androidx/constraintlayout/motion/widget/MotionLayout.java

@@ -58,6 +58,7 @@
 import androidx.constraintlayout.widget.ConstraintSet;
 import androidx.constraintlayout.widget.Constraints;
 import androidx.constraintlayout.widget.R;
+import androidx.core.view.NestedScrollingParent3;
 import androidx.core.view.ViewCompat;
 
 import java.util.ArrayList;
@@ -726,8 +727,8 @@
  * (used to talk to nested ConstraintLayouts etc.)</td>
  * </tr>
  * <tr>
- * <td>[standard view attributes]</td>
- * <td>A collection of post layout view attributes see below</td>
+ * <td>[standard view attributes](except visibility)</td>
+ * <td>A collection of post layout view attributes see below </td>
  * </tr>
  * <tr>
  * <p>
@@ -989,7 +990,7 @@
  * </p>
  */
 public class MotionLayout extends ConstraintLayout implements
-        androidx.core.view.NestedScrollingParent3 {
+        NestedScrollingParent3 {
 
     public static final int TOUCH_UP_COMPLETE = 0;
     public static final int TOUCH_UP_COMPLETE_TO_START = 1;

projects/MotionLayoutVerification/app/src/main/AndroidManifest.xml

@@ -24,6 +24,7 @@
             android:configChanges="orientation|screenSize"/>
         <activity android:name=".RotationAngular"
             android:configChanges="orientation|screenSize"/>
+        <activity android:name=".CustomSwipeClick" />
     </application>
 
 </manifest>