docs: add throws notice for isPlaying per external issue 33610
docs: add throws notice for isPlaying
per external issue 33610

Change-Id: Ibd778cb4ecc5f1717fa007ac069a7b3660ec4794

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base