updated docs

docs/docs/imaging.xml

@@ -1996,6 +1996,7 @@
             <example>train_object_detector.cpp.html</example>
 
             <example>face_detector.py.html</example>
+            <example>train_object_detector.py.html</example>
          </examples>
                                  
       </component>

docs/docs/main_menu.xml

@@ -133,6 +133,10 @@
                   <name>Face_Detector</name>
                   <link>face_detector.py.html</link>
                </item>
+               <item>
+                  <name>Train_Object_Detector</name>
+                  <link>train_object_detector.py.html</link>
+               </item>
                <item>
                   <name>Sequence_Segmenter</name>
                   <link>sequence_segmenter.py.html</link>