Use substitute-command-keys for literal key sequences

* lisp/abbrev.el (expand-region-abbrevs):
* lisp/calc/calc-graph.el (calc-graph-show-dumb):
* lisp/calc/calc-help.el (calc-help-for-help):
* lisp/calc/calc-mode.el (calc-auto-why):
* lisp/calc/calc.el (calc-do):
* lisp/calculator.el (calculator-mode):
* lisp/dired-aux.el (dired-create-files)
(dired-do-create-files-regexp, dired-create-files-non-directory):
* lisp/dired-x.el (dired-virtual):
* lisp/dired.el (dired-mark-region, dired-unmark-all-files):
* lisp/emacs-lisp/map-ynp.el (map-y-or-n-p):
* lisp/emacs-lisp/re-builder.el (reb-enter-subexp-mode):
* lisp/epa-ks.el (epa-ks--display-keys):
* lisp/erc/erc.el (erc-toggle-debug-irc-protocol):
* lisp/files.el (save-some-buffers):
* lisp/gnus/gnus-dired.el (gnus-dired-find-file-mailcap)
(gnus-dired-print):
* lisp/gnus/gnus-group.el (gnus-keep-same-level):
* lisp/gnus/gnus-score.el (gnus-score-find-trace):
* lisp/gnus/gnus.el (to-list):
* lisp/gnus/message.el (message--send-mail-maybe-partially):
* lisp/mail/supercite.el (sc-set-variable):
* lisp/minibuffer.el (minibuffer-inactive-mode):
* lisp/progmodes/etags.el (select-tags-table):
* lisp/progmodes/idlw-shell.el (idlwave-shell-mode)
(idlwave-shell-char-mode-loop):
* lisp/replace.el (query-replace-help):
* lisp/simple.el (set-variable):
* lisp/subr.el (read-char-from-minibuffer):
* lisp/textmodes/ispell.el (ispell-help, ispell-message):
* lisp/textmodes/reftex-global.el (reftex-find-duplicate-labels):
* lisp/textmodes/reftex-vars.el
(reftex-toc-include-file-boundaries)
(reftex-toc-include-labels, reftex-toc-include-index-entries)
(reftex-toc-include-context, reftex-toc-follow-mode)
(reftex-index-include-context, reftex-index-follow-mode)
(reftex-enable-partial-scans)
(reftex-auto-update-selection-buffers)
(reftex-highlight-selection):
* lisp/time.el (display-time-update):
* lisp/vc/ediff-help.el (ediff-help-for-quick-help):
* lisp/vc/ediff-init.el (ediff-keep-variants):
* lisp/vc/ediff-ptch.el (ediff-fixup-patch-map)
(ediff-patch-file-internal):
* lisp/windmove.el (windmove-delete-default-keybindings): Use
'substitute-command-keys' for literal key sequences.

* lisp/userlock.el (userlock--fontify-key): Remove function.
(ask-user-about-lock, ask-user-about-lock-help)
(ask-user-about-supersession-threat)
(ask-user-about-supersession-help): Use 'substitute-command-keys' for
literal key sequences.

* lisp/ibuffer.el (ibuffer-unmark-all): Use 'substitute-command-keys'
for command.

lisp/files.el

@@ -5806,13 +5806,13 @@ of the directory that was default during command invocation."
 
 (defun save-some-buffers (&optional arg pred)
   "Save some modified file-visiting buffers.  Asks user about each one.
-You can answer `y' or SPC to save, `n' or DEL not to save, `C-r'
+You can answer \\`y' or \\`SPC' to save, \\`n' or \\`DEL' not to save, \\`C-r'
 to look at the buffer in question with `view-buffer' before
-deciding, `d' to view the differences using
-`diff-buffer-with-file', `!' to save the buffer and all remaining
-buffers without any further querying, `.' to save only the
-current buffer and skip the remaining ones and `q' or RET to exit
-the function without saving any more buffers.  `C-h' displays a
+deciding, \\`d' to view the differences using
+`diff-buffer-with-file', \\`!' to save the buffer and all remaining
+buffers without any further querying, \\`.' to save only the
+current buffer and skip the remaining ones and \\`q' or \\`RET' to exit
+the function without saving any more buffers.  \\`C-h' displays a
 help message describing these options.
 
 This command first saves any buffers where `buffer-save-without-query' is