[JOSS Review] Re-enable rh5v2 examples or document that they currently do not work

[sea-bass]

While testing this package, I noticed that the rh5v2 examples are commented out from the CMakeLists.txt with a comment saying they are broken.

Ideally this would be fixed before a submission, but if not possible please add comments in the documentation that these are currently not working. If the maintainers are too busy to resolve this, I would recommend creating an issue with some guidelines for contributors to help out.

openjournals/joss-reviews#6696

[dmronga]

I fixed the rh5v2 tutorial, on velocity level, however. Instead I added another tutorial to show acceleration-level WBC