Small improvements to the example

Author: Alexander Clarke

src/flow_control/match/destructuring/destructure_structures.md

@@ -13,14 +13,14 @@ fn main() {
     let foo = Foo { x: (1, 2), y: 3 };
 
     match foo {
-        Foo { x: (1, b), y } => println!("a = 1, b = {},  y = {} ", b, y),
+        Foo { x: (1, b), y } => println!("First of x is 1, b = {},  y = {} ", b, y),
 
         // you can destructure structs and rename the variables,
         // the order is not important
-        Foo { y: 2, x: i } => println!("i = {:?}, j = 2", i),
+        Foo { y: 2, x: i } => println!("y is 2, i = {:?}", i),
 
         // and you can also ignore some variables:
-        Foo { y, .. } => println!("y = {}", y),
+        Foo { y, .. } => println!("y = {}, we don't care about x", y),
         // this will give an error: pattern does not mention field `x`
         //Foo { y } => println!("y = {}", y);
     }