#338 slides: Public DTD version snafus

[Jesse Glick]

http://docbook.sourceforge.net/release/slides/3.0b1/slides.dtd

says it is:

<!DOCTYPE slides
PUBLIC "-//Norman Walsh//DTD Slides XML V2.0//EN"

"http://docbook.sourceforge.net/release/slides/2.0/slides.dtd">

while

http://docbook.sourceforge.net/release/slides/3.0.0/slides.dtd

says it is

<!DOCTYPE slides
PUBLIC "-//Norman Walsh//DTD Slides XML V3.0b1//EN"

"http://docbook.sourceforge.net/release/slides/3.0b1/slides.dtd">

Presumably both sample headers are wrong. The header in
the 3.0.0 distribution (slides.dtd) claims to be 3.0b1,
as the version on the website.

[Norman Walsh]

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user_id=81663

Yep. Fixed.