update doc

_build/html/_sources/index.rst.txt

@@ -32,7 +32,8 @@ source code and build it locally. We will update the xLearn source code on pip w
 
     sudo pip install --index-url https://test.pypi.org/simple/ xlearnn 
 
-You can see the installation details from `Installation Guide`__.
+If you want to build the lastest code, or you want to use the xLearn command line
+interface, you can see how to build xLearn from source code from `Installation Guide`__.
 
 Python Demo
 ----------------------------------

_build/html/index.html

@@ -187,7 +187,8 @@ <h2>Quick Install<a class="headerlink" href="#quick-install" title="Permalink to
 <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">pip</span> <span class="n">install</span> <span class="o">--</span><span class="n">index</span><span class="o">-</span><span class="n">url</span> <span class="n">https</span><span class="p">:</span><span class="o">//</span><span class="n">test</span><span class="o">.</span><span class="n">pypi</span><span class="o">.</span><span class="n">org</span><span class="o">/</span><span class="n">simple</span><span class="o">/</span> <span class="n">xlearnn</span>
 </pre></div>
 </div>
-<p>You can see the installation details from <a class="reference external" href="install">Installation Guide</a>.</p>
+<p>If you want to build the lastest code, or you want to use the xLearn command line
+interface, you can see how to build xLearn from source code from <a class="reference external" href="install">Installation Guide</a>.</p>
 </div>
 <div class="section" id="python-demo">
 <h2>Python Demo<a class="headerlink" href="#python-demo" title="Permalink to this headline">¶</a></h2>