Alternate docs mention of breadcrumbs separator, as called out in #7601

docs/docs.html

@@ -3761,7 +3761,7 @@ body {
       <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>
     <div class="bs-docs-example">
       <ul class="breadcrumb">
         <li class="active">Home</li>