Update MarketingAPISample
Update MarketingAPISample

changed indentations and curly brace style, removed superfluous comments and other unnecessary testing lines
socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples,socketlabs/email-on-demand-examples