Merge branch 'fix/documentation-flux-fourier-nonequilibrium' into 'master'

Add documentation to Fourier non-equilibrium

See merge request !3314

(cherry picked from commit 838df590)

c0287457 Add documentation to Fourier non-equilibrium
6 jobs for !3315 with cherry-pick-838df590 in 42 seconds (queued for 2 seconds)
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