Fix duplicate Highlights anchor in 0.86 release post (#5134)

Author: fabriziocucci

website/blog/2026-06-11-react-native-0.86.mdx

@@ -13,16 +13,14 @@ This release includes comprehensive edge-to-edge support on Android 15+ and impr
 
 Following 0.83, this is the second React Native release with no user-facing breaking changes, reflecting our continued commitment to making upgrades more predictable and seamless.
 
-### Highlights
+## Highlights
 
 - [A New Home for React Native](/blog/2026/06/11/react-native-0.86#a-new-home-for-react-native)
 - [Edge-to-Edge on Android](/blog/2026/06/11/react-native-0.86#edge-to-edge-on-android)
 - [React Native DevTools Improvements](/blog/2026/06/11/react-native-0.86#react-native-devtools-improvements)
 
 {/* truncate */}
 
-## Highlights
-
 ### A New Home for React Native
 
 The React Native repository, together with React, Metro, Yoga and the React Native Website, has moved from the `facebook` GitHub organization to the `react` organization. This move reflects the transition of React and React Native to the [React Foundation](https://react.foundation/), an independent foundation dedicated to the long-term stewardship of the React ecosystem.