make Libraries link to point to the official page

[SVN r25998]

doc/Jamfile.v2

@@ -9,5 +9,6 @@ boostbook doc : src/boost.xml
      <dependency>../libs/program_options/doc//autodoc.xml 
      <dependency>../libs/algorithm/string/doc//autodoc.xml
      <dependency>../libs/logic/doc//reference.xml
+     <xsl:param>boost.libraries=../../libs/libraries.htm
 
     ;