doc change: add rel note links to external tools site

  <ul>

  <li>The tools now automatically generate Java Programming Language source files (in the <code>gen/</code> directory) and

    bytecode (in the <code>res/raw/</code> directory) from your <code>.rs</code> files.</li>

  <li>A Binary XML editor has been added.</li>

  <li>A Binary XML editor has been added (<a href="http://tools.android.com/recent/binaryxmleditor">details</a>).</li>

  <li>Traceview is now integrated into the Eclipse UI (<a href="http://tools.android.com/recent/traceviewineclipse">details</a>).</li>

  <li>The "Go To Declaration" feature for XML and <code>.java</code> files quickly show all the matches in the project

  and allows you jump to specific items such as string translations or <code>onClick</code> handlers.</li>

  <li>The Resource Chooser can create items such as dimensions, integers, ids, and booleans.</li>

  and allows you jump to specific items such as string translations or <code>onClick</code> handlers

  (<a href="http://tools.android.com/recent/gotodeclarationimprovements">details</a>).</li>

  <li>The Resource Chooser can create items such as dimensions, integers, ids, and booleans

  (<a href="http://tools.android.com/recent/resourcechoosercannowcreatearbitraryvalues">details</a>).</li>

  <li>Improvements to the Visual Layout Editor:

      <ul>

        <li>A new Palette with categories and rendering previews

        (<a href="http://tools.android.com/recent/newpalette">details</a>).</li>

        <li>A Layout action bar.</li>

        <li>A Layout Actions bar that provides quick access to common layout operations

        (<a href="http://tools.android.com/recent/layoutactionsbar">details</a>).</li>

        <li>When the Android 3.0 rendering library is selected, layouts render more like they do on devices.

        This includes rendering of status and title bars to more accurately reflect the actual

        screen space available to applications.</li>

        screen space available to applications

        (<a href="http://tools.android.com/recent/systembarandactionbar">details</a>).</li>

        <li>Zoom improvements such as fit to view, persistent scale, and keyboard access.

        (<a href="http://tools.android.com/recent/zoomimprovements">details</a>).</li>

        <li>Further improvements to <code>&lt;merge&gt;</code> layouts, as well as layouts with gesture overlays.</li>

        <li>Further improvements to <code>&lt;merge&gt;</code> layouts, as well as layouts with gesture overlays

        (<a href="http://tools.android.com/recent/improvedsupportformergetags">details</a>).</li>

        <li>Improved rendering error diagnostics.</li>

      </ul>

    </li>