Update lldb architecture doc

[xiaobai]

Summary

ArchSpec was moved from Core to Utility, so I modified the docs to
reflect that.

[davide]

LGTM, ideally this file should be autogenerated.

[davide]

Do you have commit rights or you need somebody to commit this on your behalf?

[xiaobai]

I don't have commit rights, so I need somebody to commit for me. If you can do that, that'd be great! :)

[xiaobai]

@compnerd committed this for me! r323363

www/architecture/index.html

<div id="middle">
           The Core source files contain basic functionality
           that is required in the debugger as well as the
           class represeting the debugger it self (Debugger). A
           wide variety of classes are implemented:
           </p>
           <ul>
             <li>Address (section offset addressing)</li>
             <li>AddressRange</li>
-            <li>Architecture specification</li>
             <li>Broadcaster / Event / Listener </li>
             <li>Communication classes that use Connection objects</li>
             <li>Mangled names</li>
             <li>Source manager</li>
             <li>Value objects</li>
           </ul>
         </div>
         <div class="postfooter"></div>
<div id="middle">
           a general purpose C++ library is an explicit
           non-goal of this module.
           </p>
           <p>
           This module provides following functionality:
           </p>
           <ul>
             <li>Abstract path manipulation (FileSpec)</li>
+            <li>Architecture specification (ArchSpec)</li>
             <li>Data buffers (DataBuffer, DataEncoder, DataExtractor)</li>
             <li>Logging</li>
             <li>Structured data manipulation (JSON)</li>
             <li>Streams</li>
             <li>Timers</li>
             <li>etc.</li>
           </ul>
           <p>