fix(apple): Mention not creating TTID/TTFD spans (#10960)

Explain why the SDK doesn't create TTID/TTFD spans when the app is in
the background.

Co-authored-by: vivianyentran <[email protected]>

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

@@ -335,16 +335,14 @@ This feature is available starting in SDK version `8.4.0`.
 
 </Note>
 
-By adding a span for a view controller when it's loaded, time to initial display (TTID) provides insight into how long it takes for your view controller to launch and draw its first UI frame. The SDK sets the span operation to `ui.load.initial-display` and the span description to the view controllers's name, followed by `initial display` - for example, `MainViewController initial display`.
+By adding a span for a view controller when it's loaded, time to initial display (TTID) provides insight into how long it takes for your view controller to launch and draw its first UI frame. The SDK sets the span operation to `ui.load.initial-display` and the span description to the view controller's name, followed by `initial display` - for example, `MainViewController initial display`.
 
-The span starts when the view of a view controller is loaded, and there is no other view controller transaction happening at the moment.
-
-The span finishes after the view appeared on the screen.
-
-The following chart shows how time to initial display (TTID) and [time to full display (TTFD)](#time-to-full-display) correlate to transitions between activities:
+The span starts when the view of a view controller is loaded, and there is no other view controller transaction happening at the moment. The span finishes after the view appeared on the screen. The following chart shows how time to initial display (TTID) and [time to full display (TTFD)](#time-to-full-display) correlate to transitions between activities:
 
 ![](./img/ttid-ttfd-concept.png)
 
+Since Cocoa SDK version 8.33.0, the SDK doesn't create time to initial display (TTID) and [time to full display (TTFD)](#time-to-full-display) spans for UIViewControllers presented in the background because the logic requires UI frames to be drawn.
+
 ## Time to Full Display
 
 <Note>
@@ -353,9 +351,10 @@ This feature is available starting in SDK version `8.4.0`.
 
 </Note>
 
-By adding a span for a view controller when it's loaded, time to full display (TTFD) provides insight into how long it takes your view controller to launch and load all of its content. The SDK sets the span operation to `ui.load.full-display` and the span description to the view controllers' name, followed by `full display` - for example, `MainActivity full display`.
+By adding a span for a view controller when it's loaded, time to full display (TTFD) provides insight into how long it takes your view controller to launch and load all of its content. The span starts when the view of a view controller is loaded, and there is no other view controller transaction happening at the moment. The SDK sets the span operation to `ui.load.full-display` and the span description to the view controllers' name, followed by `full display` - for example, `MainActivity full display`.
+
+Since Cocoa SDK version 8.33.0, the SDK doesn't create [time to initial display (TTID)](#time-to-initial-display) and time to full display (TTFD) spans for UIViewControllers presented in the background, because the logic requires UI frames to be drawn.
 
-The span starts when the view of a view controller is loaded, and there is no other view controller transaction happening at the moment.
 
 _Time to full display is disabled by default, but you can enable it by setting:_