fix(apple): Min SDK versions for App Starts (#11649)

Fix minimum required app versions for the App Starts Module for Mobile
Vitals.

Author: philipphofmann

docs/product/insights/mobile-vitals/app-starts.mdx

@@ -46,17 +46,8 @@ SentryAndroid.init(this) { options ->
 
 **For iOS:**
 
-- `>=8.18.0` for automatic instrumentation of [app start spans](/platforms/apple/tracing/instrumentation/automatic-instrumentation/#app-start-tracing)
+- `>=7.2.0` for automatic instrumentation of [app start spans](/platforms/apple/tracing/instrumentation/automatic-instrumentation/#app-start-tracing)
 - `>=8.21.0` for app start profiling
-- [PerformanceV2](/platforms/apple/tracing/instrumentation/automatic-instrumentation/#performance-v2) must be enabled in the SDK, e.g.:
-```swift
-import Sentry
-
-SentrySDK.start { options in
-    ...
-    options.enablePerformanceV2 = true
-}
-```
 
 By default, the **App Starts** page displays metrics for the two releases with the highest screen counts for the time range you’ve selected. To choose a different set of releases to compare, use the “release selector” at the top of the page. To change the app start type (cold or warm), use the “App Start” selector at the top of the page.