Update 06-android-app.html.md

Patty Wagner here again.  I thought of one more place where I got tripped up and had to ask for help.  I kept hitting run and it kept running to the emulator and not to the phone.  I was able to get help on the issue from Facebook, but figure the more clear the instructions are, the fewer questions, people will have in the future.
Merge branch 'source' of github.com:nightscout/nightscout.github.io into source