fix amsbits

Change-Id: I676ea54df15d1da4dca5a84d517eecc895aabcd9
updated NDK link

Change-Id: If3eb5132ca770efc41688aaf9dec0a2ce7479343
expand the section on installing the NDK

Change-Id: I4164ed74918d13536c5674f20be861ba5e32bbe8
expand the section on installing adb

Change-Id: I0ad94dd0f9d7a8f0ee197087712fa3ac3a3308d2