updated docs

docs/docs/api.xml

@@ -1120,6 +1120,9 @@
                   This is a set of functions for executing the contents of a for loop in parallel.  
                   It is useful for taking advantage of multi-processor systems.  
                </description> 
+               <examples>
+                  <example>parallel_for_ex.cpp.html</example>
+               </examples>
             </extension>
 
             <extension>

docs/docs/main_menu.xml

@@ -129,6 +129,10 @@
                   <name>Train_Object_Detector</name>
                   <link>train_object_detector.cpp.html</link>
                </item>
+               <item>
+                  <name>Parallel_For_Loops</name>
+                  <link>parallel_for_ex.cpp.html</link>
+               </item>
                <item>
                   <name>SVM-Rank</name>
                   <link>svm_rank_ex.cpp.html</link>