Update tech_docs/python/fizzbuzz.md

tech_docs/python/fizzbuzz.md

@@ -1,3 +1,4 @@
+```python
 def fizz_buzz(n):
     """
     Print the FizzBuzz sequence from 1 to n.
@@ -24,4 +25,5 @@ def main():
         print("Please enter a valid integer.")
 
 if __name__ == "__main__":
-    main()
+    main()
+```