Various doc fixes, mainly to remove innappropriate

Various doc fixes, mainly to remove innappropriate
leading "*"s.
(browse-url-new-window-p, browse-url-netscape-display,
browse-url-save-file, browse-url-generic-program): Add autoload
cookie.
(browse-url-mosaic-program, browse-url-lynx-input-field,
browse-url-lynx-input-attempts, browse-url-lynx-input-delay): Add
:version.
(browse-url-of-file-hook): Add :options.
(browse-url-lynx-emacs-args): New option.
(browse-url-lynx-emacs): Use it.
(browse-url-lynx-xterm): Use backquote.
(browse-url-emacs-display): Use Emacs version, not XEmacs.
((require 'term)): When compiling.