CRM-13890 - Cleanup message template text. Update obsolete wiki reference in Legacy.php.

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* CRM-13890: Participant status is not being passed to message template for online event registration
  http://issues.civicrm.org/jira/browse/CRM-13890
Merge pull request #2165 from davecivicrm/CRM-13890

CRM-13890 - Cleanup message template text. Update obsolete wiki referenc...