Update StereoCamera.html

I find a misspelled word  and then provide a likely correction. :)

docs/api/cameras/StereoCamera.html

@@ -50,7 +50,7 @@
 
 		<h3>[property:PerspectiveCamera cameraR]</h3>
 		<div>Right camera.This is added to [page:Layers layer 2] - objects to be rendered
-		by the left camera must also be added to this layer.</div>
+		by the right camera must also be added to this layer.</div>
 
 
 		<h2>Methods</h2>