twitter/bootstrap — pull request #6380 by Yohn (2012-12-23 12:10:32+00:00)
Title: promote using data-toggle instead of rel for tooltip and popover 

this was first submitted in pull request #3031 and was never resubmitted. recently got brought up in another issue #6284 to use the `data-` attributes so it would pass html validation

this simply updates the doc pages to use `data-toggle` instead of `rel` for both the tooltips and popovers