Rephrase and extend the documentation page

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<h3>Documentation</h3>

Documentation for buildroot includes:

<ul>

<p>Our document "Buildroot usage and documentation" is where you want

to start reading if you wish to understand how Buildroot work, or wish

to change/extend/fix things. If you find any errors (factual,

grammatical, whatever) please report them. Choose between:</p>

  <li>

    Usage and documentation is where you want to start reading if you

    wish to understand how buildroot work, or wish to

    change/extend/fix things. If you find any errors (factual,

    grammatical, whatever) please report them. Choose between:

    <p>

<ul>

  <li><a href="/downloads/buildroot.html">Latest stable release</a></li>

  <li><a href="buildroot.html">GIT head revision</a></li>

</ul>

    <p>

  </li>

  <li>

    <a href="README">README</a>. This is the README file included in the

    buildroot source release.

  </li>

  <li>

    If you find that you need help with buildroot, you can ask for help on the

    <a href= "lists.html">buildroot mailing list</a> at buildroot at uclibc.org.

    In addition the BusyBox, uClibc, and buildroot developers are also known to

    hang out on the uClibc IRC channel: #uclibc on irc.freenode.net.

  </li>

<p>If you find that you need help with Buildroot, you can ask for

help:</p>

<ul>

  <li>On the <a href="lists.html">buildroot mailing list</a>

  at <code>buildroot at uclibc.org</code></li>

  <li>On the <a href="irc://freenode.net/#uclibc">Buildroot IRC

  channel</a>, <code>#uclibc</code> on Freenode</li>

  <li>On our <a href="https://bugs.uclibc.org">bugtracker</a>.</li>

  <li>Through the various companies offering commercial Buildroot

  support.</li>

</ul>