Fix typo

Author: martin-martin

Diff for: ch09-lists-tuples-and-dictionaries/1-tuples-are-immutable-sequences.py

@@ -23,7 +23,7 @@
 # Create a tuple containing the letters of your name from a string
 my_name = tuple("David")
 
-# Exercide 5
+# Exercise 5
 # Check whether or not x is in my_name
 print("x" in my_name)