lisp/icomplete.el, lisp/ido.el: Doc fixes.

lisp/icomplete.el, lisp/ido.el: Doc fixes.

lisp/icomplete.el: Miscellaneous doc fixes.
Use Icomplete everywhere instead of icomplete for consistency.
(icomplete-max-delay-chars): Fix typo.
(icomplete-mode): Use \[].
(icomplete-tidy, icomplete-exhibit): Reflow.
(icomplete-minibuffer-setup-hook, icomplete-completions):
Remove superfluous backlashes.

lisp/ido.el: Miscellaneous doc fixes.
Use Ido everywhere instead of ido or `ido' for consistency.
(ido-record-ftp-work-directories, ido-merge-ftp-work-directories)
(ido-cache-ftp-work-directory-time, ido-slow-ftp-hosts)
(ido-slow-ftp-host-regexps, ido-reread-directory): Upcase "ftp".
(ido-separator): Extract obsolescence info from docstring and declare
with make-obsolete-variable.
(ido-minibuffer-setup-hook): Simplify example.
(ido-text, ido-text-init, ido-input-stack, ido-report-no-match)
(ido-wide-find-file, ido-wide-find-dir, ido-wide-find-dir-or-delete-dir)
(ido-completion-help, ido-completing-read): Fix typos in docstrings.
(ido-everywhere): Reflow docstring.
(ido-toggle-vc): Doc fix.
(ido-switch-buffer, ido-find-file): Use tabs to improve legibility
of long list of keybindings.