fix(apple): UserId remove note on v 6.0.1 (#6944)

Cocoa SDK 6.0.1 was released 2,5 years ago. We can remove the note.

Author: philipphofmann

src/platforms/common/enriching-events/identify-user.mdx

@@ -37,7 +37,7 @@ Your internal identifier for the user.
 
 <Note>
 
-Since version 6.0.1, if you don't provide a `userId`, the SDK falls back to `installationId`, which the SDK randomly generates once during an app's installation.
+If you don't provide a `userId`, the SDK falls back to `installationId`, which the SDK randomly generates once during an app's installation.
 
 </Note>