Small change for new sample test code

<p>In your Android Studio project, you must store the source files for

instrumented tests at

<code><var>module-name</var>/src/androidTests/java/</code>. This directory

already exists when you create a new project.</p>

<code><var>module-name</var>/src/androidTest/java/</code>. This directory

already exists when you create a new project and contains an example

instrumented test.</p>

<p>Before you begin, you should

  <a href="{@docRoot}tools/testing-support-library/index.html#setup">download