Fix typos.

Fix typos.

* allout.el
* dired-aux.el
* dired-x.el
* epa-file.el
* ps-print.el
* shell.el
* vc-hooks.el
* vc-rcs.el
* vc-sccs.el
* vc.el
* view.el
* wdired.el
* emacs-lisp/authors.el
* net/dig.el
* net/socks.el
* net/zeroconf.el
* obsolete/vc-mcvs.el
* progmodes/gdb-mi.el
* progmodes/grep.el
* progmodes/idlw-help.el
* progmodes/idlw-shell.el
* progmodes/idlwave.el
* progmodes/inf-lisp.el
* textmodes/bibtex.el
* textmodes/ispell.el
* textmodes/reftex-toc.el