scope table styles to a class, .table, instead of on the generic element as a smarter default

docs/scaffolding.html

@@ -223,7 +223,7 @@
   </div>
 
   <h2>Grid customization</h2>
-  <table class="table-bordered table-striped">
+  <table class="table table-bordered table-striped">
     <thead>
       <tr>
         <th>Variable</th>
@@ -335,7 +335,7 @@
     <div class="span8">
       <h2>Supported devices</h2>
       <p>Bootstrap supports a handful of media queries to help make your projects more appropriate on different devices and screen resolutions. Here's what's included:</p>
-      <table class="table-bordered table-striped">
+      <table class="table table-bordered table-striped">
         <thead>
           <tr>
             <th>Label</th>