bug#24616: 26.0.50; No backtrace when emacsclient --eval fails

[Eli Zaretskii <eliz@gnu.org>]

> From: npostavs@users.sourceforge.net
> Cc: 24616@debbugs.gnu.org,  clement.pit@gmail.com
> Date: Sat, 22 Oct 2016 11:35:49 -0400
> 
> Something like this?
> 
> diff --git i/doc/lispref/debugging.texi w/doc/lispref/debugging.texi
> index c88a2fa..bb3ced4 100644
> --- i/doc/lispref/debugging.texi
> +++ w/doc/lispref/debugging.texi
> @@ -152,6 +152,11 @@ Error Debugging
>  must still fulfill the criteria specified by @code{debug-on-error} and
>  @code{debug-ignored-errors}.)
>  
> +For example, setting this variable is useful to get a backtrace from
> +code evaluated by emacsclient.  If elisp code evaluated by emacsclient
> +signals an error while this variable is non-@code{nil}, the backtrace
> +will popup in the running Emacs.
> +

Yes, but please mention "--eval", and add an index entry so that this
text would be easier to locate.  Something like this:

  @cindex emacsclient, getting a backtrace
  @cindex backtrace from emacsclient's @option{--eval}

Also, a nit: I don't think we use "elisp" in the manual, we say
"Lisp" instead.

Thanks.