Don't mess with lisp-mode-variables

Don't mess with lisp-mode-variables

* doc/lispref/modes.texi (Example Major Modes): Update example to
match reality.

* lisp/chistory.el (command-history-mode): Revert previous change.

* lisp/help-fns.el (describe-variable): Revert previous change.

* lisp/emacs-lisp/lisp-mode.el (lisp-mode-variables): Rvert previous change.
(lisp-data-mode): Use full form of lisp-mode-variables for clarity.
(lisp-mode): Simplify.

* lisp/emacs-lisp/pp.el (pp-to-string): Revert previous change.

* lisp/progmodes/elisp-mode.el (emacs-lisp-mode): Case sensitive
font-lock keywords.

* lisp/progmodes/inf-lisp.el (inferior-lisp-mode): Revert previous
change.