Add one more (short) way to build point

Author: delebedev

docs/creational/builder.md

@@ -46,4 +46,7 @@ let uglierPoint = Point {
     $0.y = 0.2
     $0.z = 0.3
 }
+
+let alsoUglyPoint = Point { ($0.x, $0.y, $0.z) = (0.1, 0.2, 0.3) }
+
 ```