* elisp.texi (Top): Update node listing.

* elisp.texi (Top): Update node listing.

* variables.texi (Variables): Clarify introduction.
(Global Variables): Mention that setq is a special form.
(Local Variables): Use active voice.
(Tips for Defining): Mention marking variables as safe.
(Buffer-Local Variables): Mention terminal-local and frame-local
variables together.
(File Local Variables): Copyedits.
(Frame-Local Variables): Note that they are not really useful.
(Future Local Variables): Node deleted.