twbs/bootstrap — pull request #12673 by tlindig (2014-02-10 10:03:23+00:00)
Title: use @popover-arrow-width for offset the popover 

In popover.less, the offset to account for the popover arrow was set with absolute values (10px).
But this value depends on the width of arrow and this is set with the variable `@popover-arrow-width`.

So I replaced the absolute values with the variable.