More C++11 doc and test improvements

Examples/test-suite/cpp11_inheriting_constructors.i

@@ -4,6 +4,7 @@
 %module cpp11_inheriting_constructors
 
 %inline %{
+// Delegating constructors
 class BaseClass {
 private:
   int _val;
@@ -11,8 +12,18 @@ public:
   BaseClass(int iValue) { _val = iValue; }
 };
 
+// Constructor inheritance via using declaration
 class DerivedClass: public BaseClass {
 public:
   using BaseClass::BaseClass; // Adds DerivedClass(int) constructor
 };
+
+// Member initialization at the site of the declaration
+class SomeClass {
+public:
+    SomeClass() {}
+    explicit SomeClass(int new_value) : value(new_value) {}
+
+    int value = 5;
+};
 %}