CPP1115 — Example V_factory should list deleted assignment/copy

The V_factory should have deleted assignment/copy so add
private:
V_factory (const V_factory&) = delete;
V_factory (V_factory&&) = delete;
V_factory& operator =(const V_factory&) = delete;
V_factory& operator =(V_factory&&) = delete;

In the text change
Each generated factory class has a protected virtual destructor, a protected default constructor.
to
Each generated factory class has a protected virtual destructor, a protected default constructor, deleted copy/move constructors, and deleted copy/move assignment operators

Add deleted special member functions to type-specific value factories

Use the "= delete" feature of C++11.