Added correct syntax for c++ inheritance.

[more] Minor indent correction at namespaces intro example

c++.html.markdown

@@ -266,10 +266,9 @@ int main () {
 
 //C++ Class inheritance   
 
-class German_Sheperd   
+class German_Sheperd : public Doggie  
 {
    //This class now inherits everything public and protected from Doggie class
-   Doggie      d_dog;   
 
    //Good practice to put d_ in front of datatypes in classes   
    std::string d_type;