fix (Voice/Snippets): Fix compilation

Author: JPPortier

snippets/src/main/java/voice/callouts/Call.java

@@ -37,7 +37,7 @@ public static void main(String[] args) {
 
     CalloutsService calloutsService = client.voice().v1().callouts();
 
-    LOGGER.info(String.format("Calling phone number '%s'", phoneNumberToBeCalled));
+    LOGGER.info(String.format("Calling phone number '%s'", recipientPhoneNumber));
 
     CalloutRequestTTS request =
         CalloutRequestTTS.builder()