[shallowwater] Complete the doxygen documentation

Merged Martin Utz requested to merge fix/doxygen-shallowwater into master

fixes #697 (closed) [shallowwater] Complete the doxygen documentation

Add the entries for the shallow water model in module.txt. Ensure that all classes and functions have docstrings. Document the ShallowWaterFlux class.

Edited by Martin Utz

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