docs: Sample Code landing page - typo fixes

<ul>

  <li>Unpack the downloaded project package.</li>

  <li>In Android Studio, chose <strong>File > Import Project</strong> and select root folder of

  <li>In Android Studio, chose <strong>File > Import Project</strong> and select the root folder of

  the unpacked project.

    <p>Android Studio may ask you to choose the type of project you are importing.

      If this is the case, make sure to choose <strong>Import project from

      external model</strong> and the <strong>Gradle</strong> option.

      external model</strong> and select the <strong>Gradle</strong> option.

    </p>

  </li>

</ul>