Using better English in the code doc block

 *

 * @return object

 *   On success a result object will be returned from Mailchimp. On failure an

 *   object will be returned with the succcess as false, response code, and

 *   message. To check for a failure if the property 'success' of the object

 *   returned to be set to FALSE.

 *   object will be returned with the property succcess set to FALSE, the 

 *   response code as a property, and the message as a property. To check for 

 *   a failure, look for the property 'success' of the object returned to 

 *   be set to FALSE.

 */

function mailchimp_subscribe_process($list_id, $email, $merge_vars = NULL, $interests = array(), $double_optin = FALSE, $format = 'html') {

  $result = FALSE;