updated the docs

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extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403254

docs/docs/index.xml

@@ -108,7 +108,7 @@
                      <a href="dlib/matrix/matrix_la_abstract.h.html#svd">singular value decomposition</a>, 
                      <a href="dlib/matrix/matrix_utilities_abstract.h.html#trans">transpose</a>, 
                      <a href="dlib/matrix/matrix_math_functions_abstract.h.html#sin">trig functions</a>, etc...</li>
-                  <li>Unconstrained non-linear optimization algorithms such as 
+                  <li>Unconstrained non-linear optimization algorithms using the  
                       <a href="algorithms.html#cg_search_strategy">conjugate gradient</a>, 
                       <a href="algorithms.html#bfgs_search_strategy">BFGS</a>, and
                       <a href="algorithms.html#lbfgs_search_strategy">L-BFGS</a> techniques</li>