Correct project file.

git-svn-id: http://devel-site.sync.ro/svn/repos/userguide/trunk@26077 c2de326c-180b-0410-80ef-b70704c13d23
Merge branch 'master' of https://github.com/oxygenxml/userguide

* 'master' of https://github.com/oxygenxml/userguide:
  Correct project file.