fix docs horizontal scroll on tablet viewports

docs/assets/css/docs.css

@@ -887,7 +887,7 @@ form.bs-docs-example {
 
 /* Tablet
 ------------------------- */
-@media (max-width: 768px) {
+@media (max-width: 767px) {
   /* Remove any padding from the body */
   body {
     padding-top: 0;