Document example of using feedback icons with input groups.
Created by: le6o
It's not clear within the documentation that feedback icons should be placed outside of input groups when using add-ons.
If placed incorrectly on a horizontal form you get a positioning issue with the icon as seen here, http://jsfiddle.net/1s72tn38/1/
I was about to report this as a problem when I managed to find reference to placing the icon outside of the input-group
within a related issue. https://github.com/twbs/bootstrap/issues/12551