feat(apple): Add fatal app hangs (#12939)

Add docs for fatal app hangs starting with Cocoa SDK 8.46.0.

Author: philipphofmann

docs/platforms/apple/common/configuration/app-hangs.mdx

@@ -161,6 +161,13 @@ SentrySDK.start { options in
 }];
 ```
 
+#### Fatal App Hangs
+
+Starting with version 8.46.0, the SDK automatically detects and reports fatal app hangs. If the user or the [system watchdog](https://developer.apple.com/documentation/xcode/addressing-watchdog-terminations) terminates your app during an app hang, the SDK reports it as a fatal app hang on the next startup.
+
+
+#### Non-Fully Blocking App Hangs
+
 As stacktraces might not be 100% accurate for non-fully-blocking app hangs, you can disable them with the option `enableReportNonFullyBlockingAppHangs`:
 
 ```swift {tabTitle:Swift}