documentation improvement

samples/cpp/facedetect.cpp

@@ -8,7 +8,7 @@ using namespace cv;
 
 static void help()
 {
-    cout << "\nThis program demonstrates the cascade recognizer. Now you can use Haar or LBP features.\n"
+    cout << "\nThis program demonstrates the use of cv::CascadeClassifier class to detect objects (Face + eyes). You can use Haar or LBP features.\n"
             "This classifier can recognize many kinds of rigid objects, once the appropriate classifier is trained.\n"
             "It's most known use is for faces.\n"
             "Usage:\n"