Corrected E0637.md based on test failure

Author: jwhite927

src/librustc_error_codes/error_codes/E0637.md

@@ -15,11 +15,11 @@ more information, see [the book][bk-no].
 
 Corrected underscore example:
 ```
-fn <'a>(str1: &'a str, str2: &'a str) -> &'a str {}
+fn foo<'a>(str1: &'a str, str2: &'a str) -> &'a str {}
 ```
 
 Erroneous example with const generic:
-```compile_fail,E0637
+```compile_fail,E0261,E0637,E0658
 struct A<const N: &u8>;
 //~^ ERROR `&` without an explicit lifetime name cannot be used here
 trait B {}