CRM-13850 - Remove outdated reference to UpdatePledgeRecord.php.

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* CRM-13850: Help is Incorrect on pledge reminders tab
  http://issues.civicrm.org/jira/browse/CRM-13850
Merge pull request #2110 from freeform/CRM-13850

CRM-13850 - Remove outdated reference to UpdatePledgeRecord.php.