Update MediaRecorder.java documentation to mention it does not work on the emulator yet.
Update MediaRecorder.java documentation to mention it does not work on the emulator yet.

bug - 2532726

Change-Id: If6dbf0d89c4681a647419e1911213a4c22dc3dab

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