Update WebGLRenderer.html

docs/api/renderers/WebGLRenderer.html

@@ -152,7 +152,7 @@
 		various WebGL extensions are supported.
 		</div>
 
-		<h3>[property:Boolean gammaFactor]</h3>
+		<h3>[property:Float gammaFactor]</h3>
 		<div>Default is *2*. </div>