Fix form-control-feedback position when label has sr-only class
Fix indent
Add documentation for using optional icons with sr-only labels
explain
grunt dist
Merge branch 'pr/13320'

Conflicts:
	dist/css/bootstrap-rtl.min.css
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/dist/css/bootstrap-rtl.min.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css