Merge some documentation updates and fixes from trunk.
Merged revisions 47364,47402-47403 via svnmerge from
https://svn.boost.org/svn/boost/trunk
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r47364 | danieljames | 2008-07-12 20:32:15 +0100 (Sat, 12 Jul 2008) | 1 line
Fix a PDF link that I missed before. (in static assert)
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r47402 | danieljames | 2008-07-13 20:42:56 +0100 (Sun, 13 Jul 2008) | 2 lines
Note that emplace is only available on a few compilers.
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r47403 | danieljames | 2008-07-13 21:07:45 +0100 (Sun, 13 Jul 2008) | 2 lines
Update the implementation details.
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