Prefer ‘format’ to ‘substitute-command-keys’

Prefer ‘format’ to ‘substitute-command-keys’

* src/character.h (uLSQM, uRSQM): Move here ...
* src/doc.c (uLSQM, uRSQM): ... from here.
* src/doc.c (Fsubstitute_command_keys):
* src/syntax.c (Finternal_describe_syntax_value):
* lisp/cedet/mode-local.el (mode-local-print-binding)
(mode-local-describe-bindings-2):
* lisp/cedet/srecode/srt-mode.el (srecode-macro-help):
* lisp/cus-theme.el (describe-theme-1):
* lisp/descr-text.el (describe-text-properties-1, describe-char):
* lisp/emacs-lisp/cl-extra.el (cl--describe-class):
* lisp/emacs-lisp/cl-generic.el (cl--generic-describe):
* lisp/emacs-lisp/eieio-opt.el (eieio-help-constructor):
* lisp/emacs-lisp/package.el (describe-package-1):
* lisp/faces.el (describe-face):
* lisp/help-fns.el (help-fns--key-bindings)
(help-fns--compiler-macro, help-fns--parent-mode)
(help-fns--obsolete, help-fns--interactive-only)
(describe-function-1, describe-variable):
* lisp/help.el (describe-mode):
Prefer ‘format’ to ‘substitute-command-keys’ when either will do
to implement quoting style.  This generally makes the code simpler.