[C++-sig] Getting documentation into module

[Paul F. Kunz]

   I'm adding doc strings to my module and they show up like this

setNumberOfBins(...) unbound hippo.Display method
    Sets the number of bins on axis

I want them to show up like

setNumberOfBins(axis, number) unbound hippo.Display method
    Sets the number of bins on axis

That is, get the argument names in the documentation.   I've read the
tutorials and reference manual and tried using `arg' and `args', but
to no effect.   Could someone send an example on how to do it, if it
is possible.