Updated comments; starting to implement priority protection but backed everything out but some changes to comments

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4510 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/Documentation/NuttxUserGuide.html

@@ -13,7 +13,7 @@
       <h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1>
       <p><small>by</small></p>
       <p>Gregory Nutt<p>
-      <p>Last Updated: February 18, 2011</p>
+      <p>Last Updated: March 23, 2012</p>
     </td>
   </tr>
 </table>
@@ -1838,7 +1838,7 @@ interface of the same name.
   </li>
 </ul>
 <p>
-  POSIX semaphore interfaces:
+  <b>POSIX semaphore interfaces:</b>
 </p>
 <ul>
   <li><a href="#seminit">2.5.1 sem_init</a></li>