correct expected console output

Author: RexJaeschke

standard/attributes.md

@@ -911,7 +911,7 @@ The captured string is then passed as the argument corresponding to the target p
 > val = 123, text = <>
 > val = 123, text = <xyz>
 > val = 3, text = <1  +      2>
-> val = 123, text = <(123 + 0)>
+> val = 123, text = <((123) + 0)>
 > val = 15, text = <l\u006fcal /*...*/ + // xxx
 >   5>
 > ```