Update headers.md

Doubled paragraph deleted

Author: dsibi

versioned_docs/version-7.x/headers.md

@@ -672,8 +672,6 @@ export default function App() {
 ```
 
 ![Header custom title](/assets/headers/header-custom-title.png)
-
-You might be wondering, why `headerTitle` when we provide a component and not `title`, like before? The reason is that `headerTitle` is a property that is specific to stack navigators, the `headerTitle` defaults to a `Text` component that displays the `title`.
 </TabItem>
 </Tabs>