fix typos

source/Control_Flow_Statements.rst

@@ -35,7 +35,7 @@ and returns a list containing the ``n`` first number of the Fibonacci sequence.
    :language: python
    
 :download:`fibonacci_iteration.py <_static/code/fibonacci_iteration.py>` .
-We will see another way more elegant to implement the fibonacci suite in :ref:`Advance Programming Techniques` section.
+We will see another way more elegant to implement the fibonacci suite in :ref:`Advanced Programming Techniques` section.