feat(releases): Add some notes about the new Releases flyout

Author: billyvg

docs/product/releases/img/release_details_flyout_drawer.png

@@ -64,3 +64,15 @@ Releases are global per organization, and this list shows you other projects wit
 
 For more information about Sentry's mobile features, see the full documentation for [Android SDK](/platforms/android/), [iOS SDK](/platforms/apple/guides/ios/) and
 [React Native SDK](/platforms/react-native/).
+
+## Quick Release Details
+
+Outside of the **Releases List** page, hovering over any Release version link will open a tooltip, showing a tiny preview of the Release.
+
+<div style={{width: "309px", height: "220px"}}>
+![The Release details tooltip](./img/release_details_tooltip.png)
+</div>
+
+Clicking the link will open a quick flyout with even more details of the Release. If you want to further explore the Release, you can click the "View Full Details" button in the top right corner of the flyout.
+
+![The Releases flyout drawer after clicking the Release link](./img/release_details_flyout_drawer.png)