[dune-pdelab] Make doc in dune-pdelab-howto broken

[Christoph Grüninger]

Hi,
in dune-pdelab-howto is a small bug that prevents make doc from 
compiling the LaTeX sources. The attached patch fixes this issue.

Hope that helped,
Christoph

-- 
Ingenieure sind die Kamele, auf denen die Kaufleute reiten.
[Autor unbekannt]
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pdelab-howto-fix.patch
Type: text/x-patch
Size: 530 bytes
Desc: not available
URL: <https://lists.dune-project.org/pipermail/dune-pdelab/attachments/20120614/73c40634/attachment.bin>