Fix mode-line display in Calendar mode

Fix mode-line display in Calendar mode

* lisp/help.el (substitute-command-keys): New optional argument
NO-FACE, to avoid putting the 'help-key-binding' face on the key
bindings.
* lisp/calendar/calendar.el (calendar-mode-line-entry): Call
'substitute-command-keys' with the new optional argument non-nil.
(Bug#52366)

* doc/lispref/help.texi (Keys in Documentation): Document the new
optional argument of 'substitute-command-keys'.

* etc/NEWS: Announce the addition of a new argument to
'substitute-command-keys'.