Added all *.cpp samples reference to the 2.4.6 documentation as discussed in feature #3169

- Used lunix style slashes - works on most systems
- Removed all trailing whitespaces

modules/gpu/doc/object_detection.rst

@@ -62,7 +62,9 @@ The class implements Histogram of Oriented Gradients ([Dalal2005]_) object detec
 
 Interfaces of all methods are kept similar to the ``CPU HOG`` descriptor and detector analogues as much as possible.
 
+.. Sample code::
 
+   * : An example applying the HOG descriptor for people detection can be found at opencv_source_code/samples/cpp/peopledetect.cpp
 
 gpu::HOGDescriptor::HOGDescriptor
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