Merge pull request #17064 from paulirish/patch-1

reboot.scss typo  (shttp --> http)

scss/_reboot.scss

@@ -15,7 +15,7 @@
 // recommendations on resolving such conflicts, see
 // http://getbootstrap.com/getting-started/#third-box-sizing.
 //
-// Credit: shttp://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/
+// Credit: https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/
 
 html {
   box-sizing: border-box;