bug#35564: [PATCH v5] Tweak dired warning about "wildcard" characters

[Juri Linkov]

> It seems this read-multiple-choice needs to be rewritten anyway
> to use the minibuffer instead of read-event.  So the ability
> to override '?' could be added at the same time as well.

A patch in bug#38076 replaces read-char-choice with
read-char-from-minibuffer, and in one place in the patch
it uses read-char-from-minibuffer in files--ask-user-about-large-file
simply as

(read-char-from-minibuffer
  (concat prompt " (y)es or (n)o or (l)iterally ")
  '(?y ?Y ?n ?N ?l ?L))

Maybe it would be much simpler to use something like

(read-char-from-minibuffer
  (concat "1 occurrence of ‘?’ will not be substituted.  Proceed? (y)es or (n)o 
or (h)elp ")
  '(?y ?Y ?n ?N ?h ?H))