[v3] correct doxygen parse

[Benjamin De Kosnik]

Fixups for doxygen. Since 2012-11-20, most of C++11 has been ignored by
doxygen, resulting in some missing modules documentation even in HTML
output.

Jakub, this fixes the libstdc++.tag validation errors.

I've regenerated the gcc.gnu.org docs for 4.8.0. They look equivalent or
better than 4.7.2 to me now.

tested x86/linux

-benjamin
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