Update remote participant doc in acs calling native sdk

Author: chengyuanlai-msft

articles/communication-services/quickstarts/voice-video-calling/includes/video-calling/video-calling-android.md

@@ -610,7 +610,7 @@ private void answerIncomingCall() {
 
 ## Remote participant and remote video streams
 
-All remote participants are available through the `getRemoteParticipants()` method on a call instance. Once the call is connected, we can access the remote participants of the call and handle the remote video streams.
+All remote participants are available through the `getRemoteParticipants()` method on a call instance. Once the call becomes connected (`CallState.CONNECTED`), we can access the remote participants of the call and handle the remote video streams.
 
 When you start a call or answer an incoming call, you need to subscribe to the `addOnRemoteParticipantsUpdatedListener` event to handle remote participants. 
 

articles/communication-services/quickstarts/voice-video-calling/includes/video-calling/video-calling-ios.md

@@ -630,7 +630,7 @@ public class CallObserver: NSObject, CallDelegate, IncomingCallDelegate {
 
 ## Remote participant Management
 
-All remote participants are represented with the `RemoteParticipant` type and are available through the `remoteParticipants` collection on a call instance.
+All remote participants are represented with the `RemoteParticipant` type and are available through the `remoteParticipants` collection on a call instance once the call becomes connected (`CallState.connected`).
 
 > [!NOTE]
 > When a user joins a call, they can access the current remote participants through the `RemoteParticipants` collection. The `didUpdateRemoteParticipant` event will not trigger for these existing participants. This event will only trigger when a remote participant joins or leaves the call while the user is already in the call. 

articles/communication-services/quickstarts/voice-video-calling/includes/video-calling/video-calling-windows.md

@@ -437,7 +437,10 @@ _ = await incomingCall.AcceptAsync(acceptCallOptions);
 
 ### Remote participant and remote video streams
 
-All remote participants are available through the `RemoteParticipants` collection on a call instance. Once the call is connected, we can access the remote participants of the call and handle the remote video streams. 
+All remote participants are available through the `RemoteParticipants` collection on a call instance. Once the call becomes connected (`CallState.Connected`), we can access the remote participants of the call and handle the remote video streams. 
+
+> [!NOTE]
+> When a user joins a call, they can access the current remote participants through the `RemoteParticipants` collection. The `RemoteParticipantsUpdated` event will not trigger for these existing participants. This event will only trigger when a remote participant joins or leaves the call while the user is already in the call. 
 
 ```C#