Fix all doxygen "X is not documented" warnings
Quoting arma:
It occurred to me while looking at the doxygen comment for
router_is_already_dir_fetching_ds() that if we had something go through
and complain about all cases where there's a function argument that is
not mentioned by <b>parameter</b> (with the markup) in the doxygen
comment... we would end up with a lot of complaints.
We could fix this by placing <b></b> around documented parameters, and by documented undocumented parameters.
There might even be a way to semi-automatically do this using a script, and then clean up any mismatches.
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