Merge pull request #1564 from sras1599/patch-1

Update incorrect print output in std/box.md

Author: marioidival

src/std/box.md

@@ -62,11 +62,11 @@ fn main() {
              mem::size_of_val(&rectangle));
 
     // box size == pointer size
-    println!("Boxed point occupies {} bytes on the stack",
+    println!("Boxed point occupies {} bytes on the heap",
              mem::size_of_val(&boxed_point));
-    println!("Boxed rectangle occupies {} bytes on the stack",
+    println!("Boxed rectangle occupies {} bytes on the heap",
              mem::size_of_val(&boxed_rectangle));
-    println!("Boxed box occupies {} bytes on the stack",
+    println!("Boxed box occupies {} bytes on the heap",
              mem::size_of_val(&box_in_a_box));
 
     // Copy the data contained in `boxed_point` into `unboxed_point`