update

evaluation/intro.txt

@@ -35,6 +35,7 @@ print(pass_at_k)
 ```
 
 To better understand how pass@k metric works, we will illustrate it with some concrete examples. We select two problems from the HumanEval dataset and see how CodeParrot 🦜 (110M) performs and which code completions pass the unit tests of the two problems below:
+
 **Problem 1:**
 
 ```python