Cleanup/doxygen for 3.0 porousmediumflow
Closes #596 (closed)
See merge request !1416 (merged)
(cherry picked from commit 72589d16)
55a2be36 [doxygen] Adapt documentation for 1p, 1pnc, 1pncmin models 47f93884 [doxygen] Adapt documentation for 2p, 2p1c, 2p2c, 2pnc, 2pncmin models df53d24c [doxygen] Adapt documentation for 3p, 3p3c, 3pwateroil models e69730ba [doxygen] Adapt documentation for boxdfm, co2, mpnc, mineralization models 7784c756 [doxygen] Adapt documentation for richards, richardsnc, tracer models a06acdf4 [doxygen] Adapt documentation for nonequilibrium, nonisothermal models 57faf61d [doxygen] Adapt documentation for compositional, immiscible models and general bd292ebf [doxygen] Adapt modules.txt and handbook.bib 76f567b6 [doxygen] Adapt documentation in 1p sequential b9b3d5c6 [doxygen] Adapt documentation in 2p sequential 921a3b36 [doxygen] Adapt documentation in 2p2c sequential