Address review comments: make comment inline, fix format in print.

exercises/option/option3.rs

@@ -15,6 +15,5 @@ fn main() {
         Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),
         _ => println!("no match"),
     }
-    // Fix without deleting this line.
-    y;
+    y; // Fix without deleting this line.
 }