Rollup merge of #58075 - asettouf:master, r=varkor

Fix for issue  #58050

Hi,

a quick PR to mention in the compiler error message that `?` is a macro operator, as according to issue #58050

It passed `python x.py test src/tools/tidy`  locally, as well as the recommendation to run `/x.py test src/test/ui --stage 1 --bless`.

Let me know if anything else is needed.

src/test/ui/macros/macro-at-most-once-rep-2015-ques-rep.stderr

@@ -4,7 +4,7 @@ error: expected `*` or `+`
 LL |     ($(a)?) => {} //~ERROR expected `*` or `+`
    |          ^
    |
-   = note: `?` is not a macro repetition operator
+   = note: `?` is not a macro repetition operator in the 2015 edition, but is accepted in the 2018 edition
 
 error: expected `*` or `+`
   --> $DIR/macro-at-most-once-rep-2015-ques-rep.rs:10:11
@@ -12,7 +12,7 @@ error: expected `*` or `+`
 LL |     ($(a),?) => {} //~ERROR expected `*` or `+`
    |           ^
    |
-   = note: `?` is not a macro repetition operator
+   = note: `?` is not a macro repetition operator in the 2015 edition, but is accepted in the 2018 edition
 
 error: aborting due to 2 previous errors