title: Warning XA4211 in xamarin
body: <blockquote>
    <p>Warning XA4211: AndroidManifest.xml
    //uses-sdk/@android:targetSdkVersion '15' is less than
    $(TargetFrameworkVersion) 'v6.0'. Using API-23 for ACW compilation.
    (XA4211) </p>
  </blockquote>
  
  <p>I am trying change SDK version but cant change.</p>