CRM-14316 - update link for info on ReCaptcha on Miscellaneous Settings page.

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* CRM-14316: Recaptcha documentation link is incorrect
  http://issues.civicrm.org/jira/browse/CRM-14316
Merge pull request #2614 from davecivicrm/CRM-14316

CRM-14316 - update link for info on ReCaptcha on Miscellaneous Settings ...