Sync docs from master to gh-pages

reference/html/features.html

@@ -95,13 +95,13 @@ $(addBlockSwitches);
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>
 <ul class="sectlevel1">
-<li><a href="#_features">Features</a></li>
+<li><a href="#features">1. Features</a></li>
 </ul>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
-<h2 id="_features"><a class="link" href="#_features">Features</a></h2>
+<h2 id="features"><a class="anchor" href="#features"></a><a class="link" href="#features">1. Features</a></h2>
 <div class="sectionbody">
 <div class="ulist">
 <ul>