Clarify the comment about the output of the macro call in the showcase

Author: kellerkindt

tests/showcase.rs

@@ -26,7 +26,7 @@ BEGIN
 END"#
 );
 
-/// This module contains the content which is generated by the macro call above
+// This module contains the same content which is also generated by the macro call above
 mod what_is_being_generated {
     use asn1rs::prelude::*;