Improve the 3.4 release notes about the static analyzer new features

warnings) has improved significantly in both in the core analysis engine and

also in the kinds of issues it can find.

For example, the static analyzer now manages the following cases:

- Missing return after function pointer null check.

.. code-block:: c

  void foo(void (*f)(void)) {

    if (f)

        return;

    f();

  }

- Detect when ``delete`` is used on an uninitialized variable.

.. code-block:: c++

  void foo() {

    int *x;

    delete[] x;

  }

- Handle destructors for the argument to C++ ``delete``.

.. code-block:: c++

  class DerefClass{

  public:

    int *x;

    DerefClass() {}

    ~DerefClass() {*x = 1;}

  };

  void testDoubleDeleteClassInstance() {

    DerefClass *foo = new DerefClass();

    delete foo;

    delete foo;

  }

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