updated docs

docs/docs/imaging.xml

@@ -268,6 +268,9 @@
                 create correspondingly stronger line detections in the final
                 Hough transform.
          </description>
+         <examples>
+            <example>hough_transform_ex.cpp.html</example>
+         </examples>
                                  
       </component>
 

docs/docs/main_menu.xml

@@ -162,6 +162,10 @@
          <item nolink="true">
             <name>Examples: C++</name>
             <sub>
+               <item>
+                  <name>Hough_Transform</name>
+                  <link>hough_transform_ex.cpp.html</link>
+               </item>
                <item>
                   <name>Webcam_Face_Pose_Estimation</name>
                   <link>webcam_face_pose_ex.cpp.html</link>