[doc,libstdc++] Link maintenance for the libstdc++ manual

[Jonathan Wakely]

On 2 November 2012 00:29, Gerald Pfeifer wrote:
>
> There is a _lot_ left to do, especially around the imported lwg
> pages; those are in a vary bade state.  Any volunteer for that
> one?

They're imported, do we really want to tweak them? And then tweak them
again next time we import them?

If the problem is just missing trailing slashes at the end of URLs it
makes more sense to ask for them to be adjusted upstream, so I've CC'd
Daniel.