CRM-15666 - Fix obsolete help re: import of multi-record custom fields.

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* CRM-15666:
  https://issues.civicrm.org/jira/browse/CRM-15666
Merge pull request #4631 from davecivicrm/CRM-15666

CRM-15666 - Fix obsolete help re: import of multi-record custom fields.
fixes display of CiviContribute widget in WordPress