(Common acronyms): Remove no-longer-existing OSF.

(Common acronyms): Remove no-longer-existing OSF.
(The LPF): Make the updated URL the sole reference point.
(Learning how to do something): Update refcard price and format.
(Getting a printed manual): Sources in doc/emacs/, not man/.
Also available in PDF format.  Since the page count varies, be less precise.
(Informational files for Emacs): Remove references to deleted files
LPF and SUN-SUPPORT, and to UUCP.
(Obtaining the FAQ): Refer to the service web-page rather than SERVICE.
Remove many obsolete ways to get the FAQ, which now seems only to be
distributed with Emacs.
(Mail and news): Remove sections about Rmail Babyl that no longer apply.