components docs: backticks ==> <code>

docs/components.html

@@ -1415,7 +1415,7 @@ body { padding-bottom: 70px; }
       <h1>Breadcrumbs <small></small></h1>
     </div>
     <p class="lead">Indicate the current page's location within a navigational hierarchy.</p>
-    <p>Separators are automatically added in CSS through `:after` and `content`.</p>
+    <p>Separators are automatically added in CSS through <code>:after</code> and <code>content</code>.</p>
     <div class="bs-example">
       <ul class="breadcrumb">
         <li class="active">Home</li>