Fixes image links and graphics in documentation.

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6040 7ce873d0-865f-4ce7-a662-4bb36ea78beb
Fixes illegal HTML code.

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6041 7ce873d0-865f-4ce7-a662-4bb36ea78beb