I messed up a link. This fixes it.

[SVN r35298]

libs/libraries.htm

@@ -147,7 +147,7 @@ how to download, build, and install the libraries.</p>
     common divisor and least common multiple, from Daryle Walker.</li>
     <li><a href="../doc/html/boost_math/octonions.html">math/octonion</a> -
         Octonions, from Hubert Holin.</li>
-    <li><a href="../doc/html/boost_math/quaternion.html">math/quaternion</a> -
+    <li><a href="../doc/html/boost_math/quaternions.html">math/quaternion</a> -
         Quaternions, from Hubert Holin.</li>
     <li><a href="../doc/html/boost_math/math_special_functions.html">math/special_functions</a> -
         Mathematical special functions such as atanh, sinc, and sinhc,
@@ -446,7 +446,7 @@ how to download, build, and install the libraries.</p>
     common divisor and least common multiple, from Daryle Walker.</li>
     <li><a href="../doc/html/boost_math/octonions.html">math/octonion</a> -
       Octonions, from Hubert Holin.</li>
-    <li><a href="../doc/html/boost_math/quaternion.html">math/quaternion</a> -
+    <li><a href="../doc/html/boost_math/quaternions.html">math/quaternion</a> -
       Quaternions, from Hubert Holin.</li>
     <li><a href="../doc/html/boost_math/math_special_functions.html">math/special_functions</a> -
         Mathematical special functions such as atanh, sinc, and sinhc,