Clarify javadoc for ACTION_LONG_CLICK

Clarify in javadoc that ACTION_LONG_CLICK does not include coordinate
information.

Bug: 179692809
Test: manual test
Change-Id: I6a4edda48e140f9ba444fdef67feca4d3ed3d146

core/java/android/view/accessibility/AccessibilityNodeInfo.java

@@ -178,6 +178,8 @@ public class AccessibilityNodeInfo implements Parcelable {
 
     /**
      * Action that long clicks on the node.
+     *
+     * <p>It does not support coordinate information for anchoring.</p>
      */
     public static final int ACTION_LONG_CLICK = 0x00000020;