DOC-167 remove heading

Author: markzegarelli

src/personas/journeys.md

@@ -3,8 +3,6 @@ title: Journeys
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-## What is a journey?
-
 Journeys, a feature of Segment Personas, provide a way for marketers to personalize experiences through planning how and when to engage customers with the right campaigns and messages.
 
 Journeys enable you to define steps in a user's journey based on their event behavior and traits. You can build Journeys from your tracking events, traits, computed traits, or audiences. At each step of a journey, you can send your list of users to any personas-compatible destination.