fix filename

Author: joseluis

ch07/b-async-await/README.md

@@ -8,7 +8,7 @@ Install corofy by entering the `ch8/corofy` folder and
 write `cargo install --path .`.
 
 When that's done you can come back here and make sure that
-`src/main.rs` contains the same code as the `orignal_main.rs`
+`src/main.rs` contains the same code as the `original_main.rs`
 file does (which is the same as presented in the book).
 
 ## How to run the example
@@ -67,4 +67,4 @@ fn main() {
         thread::sleep(Duration::from_millis(100));
     }
 }
-```
+```

ch07/b-async-await/orignial_main.rs renamed to ch07/b-async-await/original_main.rs

@@ -36,4 +36,4 @@ fn main() {
         }
     }
     println!("\nELAPSED TIME: {}", start.elapsed().as_secs_f32());
-}
+}