Doxygen - another sample, preliminary comments

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| All this Doxygen stuff looks extremely promising. I'd like to start
| checking in patches to make the libstdc++ documentation use it.

I didn't (yet) have time to look into it.  I would like to defer its
integration after 2.91 -- the time needed to inspect it.  Thoughts?

-- Gaby
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