Updates and minor fixes to Day 2: Morning (#372)

third_party/rust-by-example/destructuring-structs.rs

@@ -8,7 +8,7 @@ fn main() {
     let foo = Foo { x: (1, 2), y: 3 };
     match foo {
         Foo { x: (1, b), y } => println!("x.0 = 1, b = {b}, y = {y}"),
-        Foo { y: 2, x: i }   => println!("y = 2, i = {i:?}"),
+        Foo { y: 2, x: i }   => println!("y = 2, x = {i:?}"),
         Foo { y, .. }        => println!("y = {y}, other fields were ignored"),
     }
 }