CRM-12327 One more instance of the checkbox needs the help link.

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* CRM-12327: Add help for 'Create separate activity for each contact' option
  http://issues.civicrm.org/jira/browse/CRM-12327
Merge pull request #458 from davecivicrm/4.3

CRM-12327 One more instance of the checkbox needs the help link.