[v3 patch] update references to CVS in libstdc++ docs

[Jonathan Wakely]

Following http://gcc.gnu.org/ml/libstdc++/2007-09/msg00088.html this
does the same for the libstdc++ documentation.

There are three broken links to old CVS testsuite files in
http://gcc.gnu.org/onlinedocs/libstdc++/20_util/allocator.html
I don't know where the files are in the current testsuite, so I
haven't fixed those links.

OK to commit?

Jon
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