Update ios.md for setup title-subtitle API (#10)

Author: Mohtasim

articles/communication-services/how-tos/ui-library-sdk/includes/setup-title-subtitle/ios.md

@@ -10,16 +10,16 @@ ms.service: azure-communication-services
 
 ## Customize title and subtitle
 
-To set and update call screen infoHeader `title` & `subtitle`, we have `CallScreenHeaderOptions` to configure and pass to `CallScreenOptions` by param `headerOptions`. The `title`, `Subtitle` in `CallScreenHeaderOptions` are optional parameters and `headerOptions` itself is optional as well. Default UI library title is displayed if `title` value isn't configured.
+To set and update call screen infoHeader `title` & `subtitle`, we have `CallScreenHeaderViewData` to configure and pass to `CallScreenOptions` by param `headerViewData`. The `title`, `Subtitle` in `CallScreenHeaderViewData` are optional parameters and `headerViewData` itself is optional as well. Default UI library title is displayed if `title` value isn't configured.
 
 ```swift
-var callScreenHeaderOptions = CallScreenHeaderOptions(
+var headerViewData = CallScreenHeaderViewData(
             title: "This is a custom InfoHeader",
             subtitle: "This is a custom subtitle")
 var callScreenOptions = CallScreenOptions(controlBarOptions: barOptions,
-                                          headerOptions: callScreenHeaderOptions)
+                                          headerViewData: headerViewData)
 
 // Use any event from call composite to update title & subtitle when the call is in progress.
-callScreenHeaderOptions.title = "Custom updated title"
-callScreenHeaderOptions.subtitle = "Custom updated subtitle"
+headerViewData.title = "Custom updated title"
+headerViewData.subtitle = "Custom updated subtitle"
 ```