Fixes spelling error in settings log on auth provider pages
Summary: The settings logs on auth provider pages shows "enabled accont linking" instead of "enabled account linking."
Test Plan: Checked the copy on the settings log.
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D12164