docs: Fixing onRequestPermissionResults() code sample
docs: Fixing onRequestPermissionResults() code sample

Bug b/24993310 flagged an error in the code sample, and while I had
it open, I revised it to be more like the code snippet in the
permissions training doc (which Svet approved).

See first comment for doc stage location.

bug: 24993310
Change-Id: I65336c70e086b06e28816ba8acc6435640178f9c

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