add github issue link to description of the test

Author: PonasKovas

tests/ui/proc-macro/helper-attr-builtin-derive.rs

@@ -1,10 +1,10 @@
+// This test checks that helper attributes of a derive proc macro can be used together with
+// other built-in derive macros.
+// issue: rust-lang/rust#132561
 //@ check-pass
 //@ aux-build:helper-attr.rs
 //@ edition:2021
 
-// This test checks that helper attributes of a derive proc macro can be used together with
-// other built-in derive macros.
-
 #[macro_use]
 extern crate helper_attr;