Don't use some obsolete names in documentation

Don't use some obsolete names in documentation

* admin/notes/bugtracker: Use non-obsolete name
'mail-dont-reply-to-names'.
* admin/notes/multi-tty: Mention new variable name
'x-selection-value'.
* doc/lispintro/emacs-lisp-intro.texi (Point and mark)
(Point and mark, Design @value{COUNT-WORDS}): Avoid using obsolete
name 'count-lines-region'.
* doc/lispref/hooks.texi (Standard Hooks): Remove reference to
obsolete abnormal hook 'completion-annotate-function'.
* doc/misc/efaq.texi (SPC no longer completes file names): Remove
reference to obsolete 'minibuffer-local-filename-must-match-map';
setting it has no effect.
* doc/misc/gnus.texi (NNTP): Remove reference to obsolete variable
'nntp-authinfo-file'.
* doc/misc/reftex.texi (Table of Contents, Creating Citations)
(Options - Table of Contents, Options - Referencing Labels)
(Options - Creating Citations, Options - Index Support)
(Options - Index Support, Changes): Don't use obsolete names.
* doc/misc/speedbar.texi (Minor Display Modes)
(Major Display Modes): Make variable name suggestions more in line
with existing non-obsolete variable.
* lisp/textmodes/reftex-cite.el (reftex-select-bib-mode-map):
* lisp/textmodes/reftex-ref.el (reftex-offer-label-menu): Don't use
obsolete variable names.
* lisp/progmodes/which-func.el (which-func-mode): Doc fix.