Merge pull request #54 from mkarnicki/master

Clear up wording of the Advanced screens section.

Author: adamwathan

docs/source/docs/responsive-design.blade.md

@@ -122,8 +122,8 @@ screens: {
   'sm': '500px',
   'md': [
     // Sidebar appears at 768px, so revert to `sm:` styles between 768px
-    // and 868px, which is when the main content area is wide enough to
-    // apply `md:` styles again.
+    // and 868px, after which the main content area is wide enough again to
+    // apply the `md:` styles.
     {'min': '668px', 'max': '767px'},
     {'min': '868px'}
   ],