Fix link to ublas documentation.

libs/libraries.htm

@@ -352,7 +352,7 @@ how to download, build, and install the libraries.</p>
         Maddock, Steve Cleary, et al.</li>
     <li><a href="typeof/index.html">typeof</a> -
         Typeof operator emulation, from Arkadiy Vertleyb and Peder Holt.</li>
-    <li><a href="numeric/ublas/doc/index.htm">uBLAS</a> - Basic linear algebra
+    <li><a href="numeric/ublas/index.html">uBLAS</a> - Basic linear algebra
     for dense, packed and sparse matrices, from Joerg Walter and Mathias Koch.</li>
     <li><a href="units/index.html">units</a> -
         Zero-overhead dimensional analysis and unit/quantity