use async methods in readme

sdk/communication/Azure.Communication.Identity/README.md

@@ -104,14 +104,14 @@ Console.WriteLine($"Token: {token.Token}");
 
 In case a user's tokens are compromised or need to be revoked:
 
-```C# Snippet:RevokeCommunicationUserToken
-Response revokeResponse = client.RevokeTokens(user);
+```C# Snippet:RevokeCommunicationUserTokenAsync
+Response revokeResponse = await client.RevokeTokensAsync(user);
 ```
 
 ### Deleting a user
 
-```C# Snippet:DeleteACommunicationUser
-Response deleteResponse = client.DeleteUser(user);
+```C# Snippet:DeleteACommunicationUserAsync
+Response deleteResponse = await client.DeleteUserAsync(user);
 ```
 
 ### Exchanging AAD access token of a Teams User for a Communication Identity access token

sdk/communication/Azure.Communication.Identity/tests/samples/Sample1_CommunicationIdentityClient.cs

@@ -48,13 +48,13 @@ public async Task UserAndTokenLifeCycleAsync()
             Console.WriteLine($"Expires On: {expiresOn}");
             #endregion Snippet:CreateCommunicationTokenAsync
 
-            #region RevokeCommunicationUserTokenAsync
+            #region Snippet:RevokeCommunicationUserTokenAsync
             Response revokeResponse = await client.RevokeTokensAsync(user);
-            #endregion RevokeCommunicationUserTokenAsync
+            #endregion Snippet:RevokeCommunicationUserTokenAsync
 
-            #region DeleteACommunicationUserAsync
+            #region Snippet:DeleteACommunicationUserAsync
             Response deleteResponse = await client.DeleteUserAsync(user);
-            #endregion DeleteACommunicationUserAsync
+            #endregion Snippet:DeleteACommunicationUserAsync
         }
 
         [Test]