DeadObjectException|DeadSystemRuntimeException doc

These exceptions are also thrown for FAILED_TRANSACTION.
See frameworks/base/core/jni/android_util_Binder.cpp
signalExceptionForError.

Fixes: 304353893
Test: N/A
Change-Id: Ia832aa88059feaf619e2050eb70887fe7cf77903

core/java/android/os/DeadObjectException.java

@@ -19,7 +19,8 @@ import android.os.RemoteException;
 
 /**
  * The object you are calling has died, because its hosting process
- * no longer exists.
+ * no longer exists. This is also thrown for low-level binder
+ * errors.
  */
 public class DeadObjectException extends RemoteException {
     public DeadObjectException() {

core/java/android/os/DeadSystemRuntimeException.java

@@ -18,9 +18,10 @@ package android.os;
 
 /**
  * Exception thrown when a call into system_server resulted in a
- * DeadObjectException, meaning that the system_server has died.  There's
- * nothing apps can do at this point - the system will automatically restart -
- * so there's no point in catching this.
+ * DeadObjectException, meaning that the system_server has died or
+ * experienced a low-level binder error.  There's * nothing apps can
+ * do at this point - the system will automatically restart - so
+ * there's no point in catching this.
  *
  * @hide
  */