Update link to Harvard CS50 and fix book author name (#5680)

getting_started/introduction/learning_new_features.rst

@@ -67,14 +67,14 @@ beyond the scope of Godot's documentation. If you're new to programming, we
 recommend two excellent free resources to get you started:
 
 1. Harvard university offers a free courseware to learn to program, `CS50
-   <https://cs50.harvard.edu/x/2020/>`_. It will teach you programming
+   <https://cs50.harvard.edu/x/>`_. It will teach you programming
    fundamentals, how code works, and how to think like a programmer. These
    skills are essential to become a game developer and learn any game engine
    efficiently. You can see this course as an investment that will save you time
    and trouble when you learn to create games.
 
 2. If you prefer books, check out the free ebook `Automate The Boring Stuff With
-   Python <https://automatetheboringstuff.com/>`_ by Al Sweigart's.
+   Python <https://automatetheboringstuff.com/>`_ by Al Sweigart.
 
 Learning with the community
 ---------------------------