Fix links.

help.html

@@ -40,12 +40,14 @@
 <li>view <a
 href="https://github.com/mlpack/mlpack/blob/master/README.md">the readme</a>
 file for the <font class="whitebold">mlpack</font> project</li>
-<li>read <a href="tutorials.html">tutorials</a> for using <font
-class="whitebold">mlpack</li>
-<li>refer to <a href="man.html">command-line program documentation</a> for <font
-class="whitebold">mlpack</font> programs</li>
-<li>consult <a href="doxygen.php">api documentation</a> for the C++
-interface of <font class="whitebold">mlpack</li>
+<li>read <a href="docs/mlpack-2.0.1/doxygen.php?doc=tutorials.html">tutorials</a> for using <font
+class="whitebold">mlpack 2.0.1</li>
+<li>refer to <a href="docs/mlpack-2.0.1/man.html">command-line program documentation</a> for <font
+class="whitebold">mlpack 2.0.1</font> programs</li>
+<li>consult <a href="docs/mlpack-2.0.1/doxygen.php">api documentation</a> for the C++
+interface of <font class="whitebold">mlpack 2.0.1</li>
+<li>view <a href="docs.html">documentation for other versions of mlpack</a>
+(including the git master branch)</li>
 <li>browse <a
 href="https://github.com/mlpack/mlpack"</a>mlpack source code</a> on
 Github</li>