PlantUML and rtems-docs

[Sebastian Huber]

I noticed also that we don't use the sphinxcontrib-plantuml extension:

https://pypi.org/project/sphinxcontrib-plantuml/

Should we use it? It would enable the use of images in *.pdf format for 
the Latex output. The PNGs are quite ugly in the Latex output.
-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
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E-Mail  : sebastian.huber at embedded-brains.de
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