What this MR does / why does DuMux need it:
Fixes unescaped underscore character in latex of the handbook. The dumux website deployment is else broken.
Notes for the reviewer
Fixes #1181 (closed)
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all files have to end with a
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\ No newline at end of filecomment in "Changes" of this MR.
(if not applicable remove) are newly introduced or modified physical values/functions backed up with a scientific reference (including doi) in the docs?
(if not applicable remove) if the examples are modified, is the documentation regenerated (using