Delete whitespace, tweak phrasing

README.md

@@ -7347,7 +7347,7 @@ fn main() {
                 *my_number_clone.lock().unwrap() += 1;
             }
         });
-        handle_vec.push(handle); // save the handle so we can call join on it
+        handle_vec.push(handle); // save the handle so we can call join on it outside of the loop
     }
 
     handle_vec.into_iter().for_each(|handle| handle.join().unwrap()); // call join on all handles