Improve description of <?>

Author: moritz

doc/Language/regexes.pod6

@@ -1377,7 +1377,7 @@ closing construct even when there's no opening bracket:
     "3)"  ~~ / <?> ~ ')' \d+ /;  # RESULT: «｢3)｣»
     "(3)" ~~ / <?> ~ ')' \d+ /;  # RESULT: «｢3)｣»
 
-Here <?> returns true on the first null string.
+Here C«<?>» successfully matches the null string.
 
 The order of the regex capture is original: