add method docs

intersectsBox method not documented.

docs/api/math/Frustum.html

@@ -81,6 +81,14 @@
 		Checks to see if the frustum contains the point.
 		</div>
 
+		<h3>[method:Boolean intersectsBox]([page:Box3 box])</h3>
+		<div>
+		box -- [page:Box3]
+		</div>
+		<div>
+		Check to see if the box intersects with the frustum.
+		</div>
+
 		<h3>[method:Boolean intersectsSphere]([page:Sphere sphere])</h3>
 		<div>
 		sphere -- [page:Sphere]