docs: topic && availability

Paul Gilbert writes:

I've often thought that some sort of synonym dictionary would be
useful, especially for new users. That is, give the name of some
procedure, say in Matlab, SAS or SPSS, or even a statistical term, and
get information about possible procedures to consider in S/R (and the
other way around too). I think this might be much more broadly useful
than just for R, so I wouldn't tie it too closely to R help() or CRAN.

Yes, it is much more broadly useful.

Nevertheless, using \index{} in Rd files would be one source for such
info, almost ``for free'' ...

-k
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