GRAVITY-1030 Adding another easter egg (#1106)

Author: tmonck

site/global-guides/voice/authentication.mdx

@@ -33,7 +33,7 @@ In order to retrieve the token, you will use Basic Authentication `ClientID:Clie
 ```sh
 curl --request POST \
   --url https://id.voxbone.com/api/v1/oauth2/token \
-  --header 'Authorization: Basic PEJhc2ljIEF1dGggVXNlcm5hbWU+OjxCYXNpYyBBdXRoIFBhc3N3b3JkPg==' \
+  --header 'Authorization: Basic aGdyYW5nZXI6Q3IwMGskaEBuayQ=' \
   --header 'Content-Type: application/x-www-form-urlencoded' \
   --data grant_type=client_credentials \
   --data scope=voice.webrtc