warning: @warning{} can't have blank lines

[Graham Percival]

Warning: @warning{} is a macro, and thus cannot handle blank lines.
Certain output formats might handle it, but it is *not* guaranteed to
work, and in fact it *doesn't* work in all output formats.  (I think
that pdf is the difficult one)

if you really, really, really want multiple paragraphs in there, you
can fake it with @sp 1, but that is heavily un-recommended.  Another
option might be to use @warning... @end warning, but the last time I
looked into it, there was some reason not to do that.  I think it was
because @cartouche couldn't be split up in that manner?


Anyway, I recommend that if you find yourself wanting multiple
paragraphs inside a @warning, you find some way to rewrite your text.
Quite apart from the technical issues, we should keep @warnign{}s
short -- otherwise they lose their impact.

Cheers,
- Graham