doxygen markup in tr1/tuple

[Benjamin Kosnik]

>Which seem to have been added to the last specialisation of each of 
>these classes. Any particular reason they are attached to the last 
>speciailisation, when there is already some markup attached to the 
>forward decleration?

You can generate the doxygen html docs yourself with "make doxygen" in
the libstdc++ build directory. If you can generate better docs for this
file, please do so. 

The other markup, on the declarations, was not outputting information in
the class inheritance diagrams. I don't know why. I don't think it's
necessary to document all the specializations for tuple, however.

-benjamin