fix lingering tables bug

docs/assets/css/bootstrap.css

@@ -1200,6 +1200,11 @@ table {
 .table-bordered td {
   border-left: 1px solid #dddddd;
 }
+.table-bordered thead:first-child tr:first-child th,
+.table-bordered tbody:first-child tr:first-child th,
+.table-bordered tbody:first-child tr:first-child td {
+  border-top: 0;
+}
 .table-bordered thead:first-child tr:first-child th:first-child,
 .table-bordered tbody:first-child tr:first-child td:first-child {
   -webkit-border-radius: 4px 0 0 0;

less/tables.less

@@ -79,6 +79,7 @@ table {
   thead:first-child tr:first-child th,
   tbody:first-child tr:first-child th,
   tbody:first-child tr:first-child td {
+    border-top: 0;
   }
   // For first th or td in the first row in the first thead or tbody
   thead:first-child tr:first-child th:first-child,