doc change: include SDK Tools in notice to 1.6 developers.

    you will notice several important differences:</p>

    <div class="toggle-content-toggleme" style="display:none">

    <ul>

    <ul style="padding-bottom:.0;">

    <li style="margin-top:.5em">The SDK downloadable package includes <em>only</em>

    the latest version of the Android SDK Tools.</li>

    <li>Once you've installed the SDK, you now use the Android SDK and AVD Manager

    an SDK package again. Instead, you will use the Android SDK and AVD Manager to

    keep your development environment up-to-date. </li>

    </ul>

    <p>If you are currently using the Android 1.6 SDK, you do not need

    to install the new SDK, because your existing SDK includes the Android SDK and

    AVD Manager tool. To develop against Android 2.0, for example, you can

    just download the Android 2.0 platform into your existing SDK. Refer to

    <a href="adding-components.html">Adding SDK Components</a>.</p>

    <p style="margin-top:0">If you are currently using the Android 1.6 SDK, you

    do not need to install the new SDK, because your existing SDK already 

    includes the Android SDK and AVD Manager tool. To develop against Android 

    2.0, for example, you can just download the Android 2.0 platform (and 

    updated SDK Tools) into your existing SDK. Refer to <a 

    href="adding-components.html">Adding SDK Components</a>.</p>

    </div>

    <a href='#' class='toggle-content-button show' onclick="toggleContent(this);return false;">

  </div>

  <p>If you are new to the Android SDK, please read the <a href="#quickstart">Quick Start</a>,

  below, for an overview of the installation process and how to set up your environment.</p>

  below, for an overview of how to install and set up the SDK.</p>

  <table class="download">