Fixed grammar and added to svn:ignore list.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403492

dlib/optimization/optimization_line_search.h

@@ -301,7 +301,7 @@ namespace dlib
         double last_val = f0;
         double last_val_der = d0;
 
-        // the bracketing stage will find a find a range of points [a,b]
+        // The bracketing stage will find a range of points [a,b]
         // that contains a reasonable solution to the line search
         double a, b;