fix voice testing oc (#219)

Author: abizzaar

fern/test/voice-testing.mdx

@@ -57,6 +57,8 @@ Below are three example test cases to illustrate how you can configure detailed
 
 ### Example 1: Billing Support
 
+In this example, we will simulate a customer who is frustrated and calling about a billing discrepancy.
+
 **Script:** 
 ```md title="Script" wordWrap
 1. Express anger over an unexpected charge and the current bill appearing unusually high.