Don't refer to Emacs 24.3 or older in FAQ

Don't refer to Emacs 24.3 or older in FAQ

* doc/misc/efaq.texi: Don't say that the FAQ has been edited.
(Displaying the current line or column, Automatic indentation)
(Problems with very large files, Emacs for other operating systems)
(Right-to-left alphabets, Expanding aliases when sending mail): Remove
references to Emacs 24.3 or older.

(Learning how to do something): Don't include the reference card
price; it is currently incorrect and is likely to be incorrect again
in the future.