updated docs

docs/docs/imaging.xml

@@ -1914,6 +1914,9 @@
             It is created using the <a href="#scan_fhog_pyramid">scan_fhog_pyramid</a>
             object.  
          </description>
+         <examples>
+            <example>face_detection_ex.cpp.html</example>
+         </examples>
                                  
       </component>
             

docs/docs/main_menu.xml

@@ -266,6 +266,10 @@
                   <name>FHOG_Object_Detection</name>
                   <link>fhog_object_detector_ex.cpp.html</link>
                </item>
+               <item>
+                  <name>Face_Detection</name>
+                  <link>face_detection_ex.cpp.html</link>
+               </item>
                <item>
                   <name>SURF</name>
                   <link>surf_ex.cpp.html</link>