impr(apple): TTID/TTFD only for UIViewControllers

Add note that TTID/TTFD only work with UIViewControllers and not
SwiftUI.

Author: philipphofmann

docs/platforms/apple/common/tracing/instrumentation/automatic-instrumentation.mdx

@@ -349,7 +349,7 @@ When the user interaction transaction is not finished yet, but the user makes a
 
 <Note>
 
-This feature is available starting in SDK version `8.4.0`.
+This feature only works for UIViewControllers and not for SwiftUI.
 
 </Note>
 
@@ -365,7 +365,7 @@ Since Cocoa SDK version 8.33.0, the SDK doesn't create time to initial display (
 
 <Note>
 
-This feature is available starting in SDK version `8.4.0`.
+This feature only works for UIViewControllers and not for SwiftUI.
 
 </Note>