Update Chat SDK features checklist for iOS SDK GA

Updated feature checklist for iOS: 1) adding metadata to chat thread 2) adding display name to typing indicator. These are two new capabilities now supported in the iOS Chat SDK.
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cc: @knvsl

Author: darmour

articles/communication-services/concepts/chat/sdk-features.md

@@ -38,8 +38,8 @@ The following list presents the set of features which are currently available in
 |                   | Get notified when participants are actively typing a message in a chat thread                                         | ✔️   | ❌    | ❌  | ❌  | ✔️  | ✔️  |	
 |                   | Get all messages in a chat thread                                                                        | ✔️   | ✔️  | ✔️    | ✔️  |  ✔️    | ✔️   |	
 |                   | Send Unicode emojis as part of message content                                                                            | ✔️   | ✔️  | ✔️    | ✔️  |  ✔️    | ✔️   |	
-|                   | Add metadata to chat messages                                                                            | ✔️   | ✔️  | ✔️    | ✔️  |  ❌    | ✔️   |	
-|                   | Add display name to typing indicator notification                                                                            | ✔️   | ✔️  | ✔️    | ✔️  |  ❌    | ✔️   |	
+|                   | Add metadata to chat messages                                                                            | ✔️   | ✔️  | ✔️    | ✔️  |  ✔️    | ✔️   |	
+|                   | Add display name to typing indicator notification                                                                            | ✔️   | ✔️  | ✔️    | ✔️  |  ✔️    | ✔️   |	
 |Real-time notifications (enabled by proprietary signaling package**)|  Chat clients can subscribe to get real-time updates for incoming messages and other operations occurring in a chat thread. To see a list of supported updates for real-time notifications, see [Chat concepts](concepts.md#real-time-notifications)                                     | ✔️   | ❌    | ❌  | ❌  | ✔️  | ✔️  |	
 |Mobile push notifications with Notification Hub |  The Chat SDK provides APIs allowing clients to be notified for incoming messages and other operations occurring in a chat thread by connecting an Azure Notification Hub to your Communication Services resource. In situations where your mobile app is not running in the foreground, patterns are available to [fire pop-up notifications](../notifications.md) ("toasts") to inform end-users, see [Chat concepts](concepts.md#push-notifications).                                     | ❌   | ❌    | ❌  | ❌  | ❌  | ✔️  |	
 | Server Events with Event Grid             | Use the chat events available in Azure Event Grid to plug custom notification services or post that event to a webhook to execute business logic like updating CRM records after a chat is finished   | ✔️   | ✔️  | ✔️    | ✔️  |  ✔️    | ✔️   |