Update DepthTexture.html

docs/api/en/textures/DepthTexture.html

@@ -119,7 +119,7 @@
 		<h3>[property:Boolean isDepthTexture]</h3>
 		<p>Read-only flag to check if a given object is of type [name].</p>
 
-		<h3>[property:String compareFunction]</h3>
+		<h3>[property:number compareFunction]</h3>
 		<p>
 		This is used to define the comparison function used when comparing texels in the depth texture to the value in the depth buffer.<br /><br/>