Update android.md
Update android.md

Updated tutorial as stated here https://github.com/auth0/docs/issues/395
yvonnewilson/docs,Catografix/docs,sandrinodimattia/docs,Annyv2/docs,auth0/docs,Annyv2/docs,yvonnewilson/docs,auth0/docs,khorne3/docs,auth0/docs,Catografix/docs,hamzawi06/docs,miparnisari/docs,hamzawi06/docs,jeffreylees/docs,Annyv2/docs,hamzawi06/docs,khorne3/docs,jeffreylees/docs,Catografix/docs,sandrinodimattia/docs,khorne3/docs,yvonnewilson/docs,jeffreylees/docs,sandrinodimattia/docs