Added depth function property to Material docs (#9534)

docs/api/materials/Material.html

@@ -80,6 +80,11 @@
 		Whether to have depth test enabled when rendering this material. Default is *true*.
 		</div>
 
+		<h3>[property:Integer depthFunc]</h3>
+		<div>
+		What depth function to use. Default is [page:Materials THREE.LessEqualDepth].
+		</div>
+
 		<h3>[property:Boolean depthWrite]</h3>
 		<div>
 		Whether rendering this material has any effect on the depth buffer. Default is *true*.