[docs] [issue13433] [doc] Improve string format documentation regarding %g

Change by Irit Katriel : ---------- title: String format documentation contains error regarding %g -> [doc] Improve string format documentation regarding %g versions: +Python 3.10, Python 3.8, Python 3.9 -Python 2.7, Python 3.2, Python 3.3 _______________________________________ Python tracker https://bugs.python.org/issue13433 _______________________________________