Acs sms pn codeowners (Azure#24313)

* updating codeowners for azure communication services SMS & PhoneNumbers

* removed extra '@'

* added '/' on directories

Author: AlonsoMondal

.github/CODEOWNERS

@@ -181,8 +181,10 @@
 #/<NotInRepo>/            @ms-premp @qiaozha
 
 # PRLabel: %Communication
-/sdk/communication/                              @acsdevx-msft
-/sdk/communication/Azure.Communication.Identity/ @Azure/acs-identity-sdk
+/sdk/communication/                                     @acsdevx-msft
+/sdk/communication/Azure.Communication.PhoneNumbers/    @RoyHerrod @danielav7 @whisper6284 @AlonsoMondal
+/sdk/communication/Azure.Communication.Sms/             @RoyHerrod @arifibrahim4
+/sdk/communication/Azure.Communication.Identity/        @Azure/acs-identity-sdk
 
 # ServiceLabel: %Compute %Service Attention
 # PRLabel: %Compute