Remove the link to 'other forms of documentation' since no one's updating it.

[SVN r68977]

libs/libraries.htm

@@ -68,12 +68,6 @@ content="text/html; charset=iso-8859-1">
 <p>See <a href="../more/getting_started.html">Getting Started</a>  page to find out
 how to download, build, and install the libraries.</p>
 
-<p>Documentation for some Boost libraries is available in other forms,
-  including DocBook, XSL Formatting Objects, and Unix man pages. This
-  documentation is <a
-  href="https://sourceforge.net/project/showfiles.php?group_id=7586&package_id=159715">available
-  on Sourceforge.</a></p>
-
 <hr>
 
 <h2>Libraries Listed <a name="Alphabetically">Alphabetically</a></h2>