updated docs

docs/docs/ml.xml

@@ -2721,7 +2721,8 @@ Davis E. King. <a href="http://jmlr.csail.mit.edu/papers/volume10/king09a/king09
          <spec_file link="true">dlib/svm/structural_svm_object_detection_problem_abstract.h</spec_file>
          <description>
                This object is a tool for learning the parameter vector needed to use
-               a <a href="imaging.html#scan_image_pyramid">scan_image_pyramid</a>,
+               a <a href="imaging.html#scan_fhog_pyramid">scan_fhog_pyramid</a>,
+               <a href="imaging.html#scan_image_pyramid">scan_image_pyramid</a>,
                <a href="imaging.html#scan_image_boxes">scan_image_boxes</a>, or
                <a href="imaging.html#scan_image_custom">scan_image_custom</a> object.