Gammer fix

src/librustc_error_codes/error_codes/E0477.md

@@ -21,9 +21,9 @@ fn print_string<'a>(s: Mutex<MyString<'a>>) {
 }
 ```
 
-In this example, the closure doesn't satisfy the `'static` lifetime constraint.
-To fix this kind of error, you need to double check lifetime of the type. Here,
-we can fix this problem by giving `s` a static lifetime:
+In this example, the closure does not satisfy the `'static` lifetime constraint.
+To fix this error, you need to double check the lifetime of the type. Here, we
+can fix this problem by giving `s` a static lifetime:
 
 ```
 use std::sync::Mutex;