Merge a couple of simple documentation fixes.
Merged revisions 47881-47882 via svnmerge from
https://svn.boost.org/svn/boost/trunk
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r47881 | danieljames | 2008-07-30 10:44:26 +0100 (Wed, 30 Jul 2008) | 1 line
Fix a link and a header.
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r47882 | danieljames | 2008-07-30 11:46:27 +0100 (Wed, 30 Jul 2008) | 1 line
Use the correct library page for the asio documentation.
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