Add to what's new

Author: Montoya

docs/whats-new.md

@@ -11,6 +11,8 @@ of the [MetaMask developer page](https://metamask.io/developer/).
 
 ## December 2024
 
+- Documented [Snap Notifications Expanded View](/snaps/features/notifications/#expanded-view). 
+  ([#1774](https://github.com/MetaMask/metamask-docs/pull/1774))
 - Documented [`snap_getInterfaceContext`](/snaps/reference/snaps-api/#snap_getinterfacecontext).
   ([#1772](https://github.com/MetaMask/metamask-docs/pull/1772))