Fixed Java SDK 7.x example for <Gather>
Fixed Java SDK 7.x example for <Gather>

TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets,TwilioDevEd/api-snippets