bug#31683: emacs-lisp-intro.texi - opportunity to link eintr to elisp

[Eli Zaretskii]

> From: Van L <van@scratch.space>
> Date: Sat, 2 Jun 2018 23:30:35 +1000
> Cc: 31683-done@debbugs.gnu.org
> 
> >> : 8cda6f8f44b (Glenn Morris             2007-09-06  2150) learn how to 
> >> read it.@footnote{@code{(quote hello)} is an expansion of
> > 
> > I don't think I agree: the relation to expressions is too far-fetched
> > here.
> 
> #+BEGIN_EXAMPLE
> 8cda6f8f44b (Glenn Morris             2007-09-06  1151) The printed 
> representation of both atoms and lists are called
> 8cda6f8f44b (Glenn Morris             2007-09-06  1152) @dfn{symbolic 
> expressions} or, more concisely, @dfn{s-expressions}.

Which is actually related to the second location you mentioned, and
seems to explain enough of what an s-expression is to be
self-contained.

In general, this manual is not an introduction chapter for the ELisp
manual, and never wanted to be.  It only includes cross-references to
the ELisp manual where it just mentions some subtlety, but doesn't
describe it.  These two places don't seem like they fit.