Use the correct library page for the asio documentation.

[SVN r47882]

doc/Jamfile.v2

@@ -6,7 +6,7 @@
 project boost/doc ;
 import boostbook : boostbook ;
 
-alias asio : ../libs/asio/doc//asio ;
+alias asio : ../libs/asio/doc//asio/<xsl:param>boost.libraries=../../libs/libraries.htm ;
 
 boostbook doc
     :