Docs: Removed unneeded shininess information. See #7252.

docs/api/materials/MeshPhongMaterial.html

@@ -68,7 +68,7 @@
 		</div>
 
 		<h3>[property:Float shininess]</h3>
-		<div>How shiny the specular highlight is; a higher value gives a sharper highlight. Default is *30*. It should not be set to 0.</div>
+		<div>How shiny the specular highlight is; a higher value gives a sharper highlight. Default is *30*.</div>
 
 		<h3>[property:boolean metal]</h3>
 		<div>