Update WebGLRenderTargetCube.html

docs/api/renderers/WebGLRenderTargetCube.html

@@ -28,7 +28,7 @@
 		<div>
 		[page:Float width] - The width of the renderTarget. <br />
 		[page:Float height] - The height of the renderTarget. <br />
-		options - (optional object that holds texture parameters for an auto-generated target
+		options - (optional) object that holds texture parameters for an auto-generated target
 		texture and depthBuffer/stencilBuffer booleans.
 
 		For an explanation of the texture parameters see [page:Texture Texture]. The following are