Update README.md

Author: brendaweles

python-isinstance/README.md

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-# How Does `isinstance()` Work in Python?
+# What Does isinstance() Do in Python?
 
-This folder provides the code examples for the Real Python tutorial [How Does `isinstance()` Work in Python?](https://realpython.com/how-does-python-isinstance-work/).
+This folder provides the code examples for the Real Python tutorial [What Does isinstance() Do in Python?](https://realpython.com/what-does-isinstance-do-in-python/).
 
 The `.py` files contain the code found in the tutorial. 
 
 When setting up your tutorial environment, make sure `balls.py`, `balls_v2.py`, and `player_iterables.py` are in your program folder.  You'll need to import content from these to replicate the tutorial examples.
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