bug#24051: 24.5; doc of `external-debugging-output'

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Sun, 28 Jan 2018 19:24:18 -0500
> Cc: 24051@debbugs.gnu.org, phillip.lord@russet.org.uk
> 
> (Also not entirely sure about how the texinfo markup should be for
> this.)
> 
>     For example
>     @example
>     (print "This is the output #'external-debugging-output)
>     @end example
>     would print @samp{This is the output} to standard error.

You should use @print{} for displaying the results (inside the
@example, not outside it).  There are examples of that elsewhere in
streams.texi.