[patch] Fix libstdc++ doxygen page for basic_streambuf

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

This removes an unclosed @{ group marker so that Doxygen doesn't put
half the members of basic_streambuf in the "Friends" section (see
http://stackoverflow.com/q/14988997/981959)

I also changed uses of __streambuf_type to basic_streambuf, which
makes the Doxygen page look better because it doesn't use the
non-standard name.

        * include/std/streambuf (basic_streambuf): Use injected class name
        instead of non-standard __streambuf_type typedef. Fix unclosed Doxygen
        group.

Tested x86_64-linux, committed to trunk.  I'll also make a smaller
change to 4.6 and 4.7 to just fix the doxygen group markup.

Attachment: patch.txt
Description: Text document