doxygen fixes

[Jonathan Wakely]

>        * include/std/iostream: Fix doxygen link.
>        * include/bits/forward_list.h: Fix doxygen markup.
>        * include/ext/vstring.h: Escape backslash in doxygen comment.
>        * include/bits/basic_string.h: Likewise.
>
> tested with make doc-html-doxygen on GNU/Linux x86_64
>
> Doc fixes only, so OK for trunk?

oops, patch attached this time!
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