Adjust the docs on opacity for transmission (#27281)

docs/api/en/materials/MeshPhysicalMaterial.html

@@ -286,7 +286,7 @@
 			property can be used to model these materials.<br />
 
 			When transmission is non-zero, [page:Material.opacity opacity] should be
-			set to `0`.
+			set to `1`.
 		</p>
 
 		<h3>[property:Texture transmissionMap]</h3>