Fix E0741 error code explanation

Use OK ! like other explanations

src/librustc_error_codes/error_codes/E0477.md

@@ -37,8 +37,7 @@ fn i_want_static_closure<F>(a: F)
 
 fn print_string(s: Mutex<MyString<'static>>) {
 
-    i_want_static_closure(move || {     // error: this closure has lifetime 'a
-                                        //        rather than 'static
+    i_want_static_closure(move || {     // ok!
         println!("{}", s.lock().unwrap().data);
     });
 }