docs: better message when OS detection fails
docs: better message when OS detection fails

Change-Id: I7fd7ee9f10832c6ccaf6dbf9aca5d3342a3bb566

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