Update E0565 examples

Author: JohnTitor

src/librustc_error_codes/error_codes/E0565.md

@@ -2,16 +2,20 @@ A literal was used in a built-in attribute that doesn't support literals.
 
 Erroneous code example:
 
-```ignore (compile_fail not working here; see Issue #43707)
-#[inline("always")] // error: unsupported literal
-pub fn something() {}
+```compile_fail,E0565
+#[repr("C")] // error: meta item in `repr` must be an identifier
+struct Repr {}
+
+fn main() {}
 ```
 
 Literals in attributes are new and largely unsupported in built-in attributes.
 Work to support literals where appropriate is ongoing. Try using an unquoted
 name instead:
 
 ```
-#[inline(always)]
-pub fn something() {}
+#[repr(C)] // ok!
+struct Repr {}
+
+fn main() {}
 ```