Comments updated to keep the consistency

Author: jesusprubio

compiler/rustc_error_codes/src/error_codes/E0542.md

@@ -13,9 +13,9 @@ fn _stable_fn() {}
 fn _stable_const_fn() {}
 
 #[stable(feature = "_deprecated_fn", since = "0.1.0")]
-#[rustc_deprecated( // invalid
+#[rustc_deprecated(
     reason = "explanation for deprecation"
-)]
+)] // invalid
 fn _deprecated_fn() {}
 ```
 
@@ -25,17 +25,17 @@ To fix the issue you need to provide the `since` field.
 #![feature(staged_api)]
 #![stable(since = "1.0.0", feature = "test")]
 
-#[stable(feature = "_stable_fn", since = "1.0.0")]
+#[stable(feature = "_stable_fn", since = "1.0.0")] // ok!
 fn _stable_fn() {}
 
-#[rustc_const_stable(feature = "_stable_const_fn", since = "1.0.0")]
+#[rustc_const_stable(feature = "_stable_const_fn", since = "1.0.0")] // ok!
 fn _stable_const_fn() {}
 
 #[stable(feature = "_deprecated_fn", since = "0.1.0")]
 #[rustc_deprecated(
     since = "1.0.0",
     reason = "explanation for deprecation"
-)]
+)] // ok!
 fn _deprecated_fn() {}
 ```