Fixed incorrect comment.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402924

dlib/svm/pegasos.h

@@ -146,7 +146,7 @@ namespace dlib
             if (y*w.inner_product(x) < 1)
             {
 
-                // compute: w = (1-learning_rate*lambda) + y*learning_rate*x
+                // compute: w = (1-learning_rate*lambda)*w + y*learning_rate*x
                 w.train(x,  1 - learning_rate*lambda,  y*learning_rate);
 
                 scalar_type wnorm = std::sqrt(w.squared_norm());