Update CONTRIBUTING.md

Author: mdo

CONTRIBUTING.md

@@ -18,7 +18,7 @@ the preferred channel for [bug reports](#bug-reports), [features requests](#feat
 and [submitting pull requests](#pull-requests), but please respect the following
 restrictions:
 
-* Please **do not** use the issue tracker for personal support requests.  Stack
+* Please **do not** use the issue tracker for personal support requests. Stack
   Overflow ([`twitter-bootstrap-3`](https://stackoverflow.com/questions/tagged/twitter-bootstrap-3) tag), [Slack](https://bootstrap-slack.herokuapp.com/) or [IRC](README.md#community) are better places to get help.
 
 * Please **do not** derail or troll issues. Keep the discussion on topic and
@@ -28,7 +28,7 @@ restrictions:
   [`Normalize`](https://github.com/necolas/normalize.css) (open them in
   their respective repositories).
 
-* Please **do not** open issues regarding the official themes offered on http://themes.getbootstrap.com/ . Instead, please email any questions or feedback regarding those themes to `themes AT getbootstrap DOT com`.
+* Please **do not** open issues regarding the official themes offered on <http://themes.getbootstrap.com/>. Instead, please email any questions or feedback regarding those themes to `themes AT getbootstrap DOT com`.
 
 
 ## Issues and labels