maybe the 'plane' should be 'spherical'

docs/api/en/math/Spherical.html

@@ -40,7 +40,7 @@
 
 		<h3>[method:Spherical clone]()</h3>
 		<p>
-		Returns a new plane with the same [page:.radius radius], [page:.phi phi]
+		Returns a new spherical with the same [page:.radius radius], [page:.phi phi]
 		and [page:.theta theta] properties as this one.
 		</p>