Update GeometryUtils.merge docs.

docs/api/extras/GeometryUtils.html

@@ -24,10 +24,11 @@
 
 		<h2>Methods</h2>
 
-		<h3> .merge( [page:Geometry geometry1] , [page:Geometry geometry2] )</h3>
+		<h3> .merge( [page:Geometry geometry1] , [page:Geometry geometry2], [page:Integer materialOffset] )</h3>
 		<div>
 		geometry1 — Parent geomentry element <br />
 		geometry2 — Geometry that need to be added in parent <br />
+		materialOffset — Offset applied to all face material indices. Default : 0 <br />
 		</div>
 		
 		<h3> .removeMaterials( [page:Geometry geometry1] , [page:Material materialIndexArray] )</h3>