Update android_workflow.dart

packages/flutter_tools/lib/src/android/android_workflow.dart

@@ -26,7 +26,7 @@ class AndroidWorkflow extends Workflow {
     };
 
     androidValidator.addValidator(new Validator(
-      'Android SDK',
+      'Android Studio / Android SDK',
       description: 'enable development for Android devices',
       resolution: 'Download from https://developer.android.com/sdk/ (or visit '
         'https://flutter.io/setup/#android-setup for detailed instructions)',