bug#31567: Acknowledgement (emacs-lisp-intro.pdf - two undefined items - page 1 (PDF viewer page 17 of 271))

[Eli Zaretskii]

> From: Van L <van@scratch.space>
> Date: Wed, 23 May 2018 21:23:31 +1000
> 
> `@xref{Complications}’ has no target in at `tex’ context.

Yes, someone made this section be a node only in the on-line versions,
but forgot to review all the cross-references to it.  There were a
couple more like that in the manual.

> Maybe it needs to read `@ifnottex @xref{Complications} @end ifnottex’.

No, that's too radical.  I simply fixed the cross-references to work
in the printed version of the manual as well.

Thanks.