Merged requested to merge cleanup/handbook3.6 into master
What this MR does / why does DuMux need it:
Update the current version of DuMux and adapt phrasing.
Notes for the reviewer
We could add another section (section 6.3.4) for the FCDiamond discretization scheme. However, I would suggest to include that until release/3.7 as it will require some team communication.
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