Fixed documentation link.

index.html

@@ -225,7 +225,7 @@
 				<span></span>
 			</a>
 			<div id="content">
-				<a href="docs/index.html#Manual/Introduction/Creating_a_scene">documentation</a><br />
+				<a href="docs/index.html#manual/introduction/Creating-a-scene">documentation</a><br />
 				<a href="examples/">examples</a><br /><br />
 
 				<a href="https://github.com/mrdoob/three.js/archive/master.zip">download</a><br /><br />