Address @iherman comment in PR.

> shouldn't it be "...with a `@graph` property can be useful for saving the repetition of `@context`"?

Author: gkellogg

index.html

@@ -1863,7 +1863,7 @@ <h1>Advanced Concepts</h1>
     and may be necessary when describing a disconnected graph,
     where nodes may not reference each other. In such cases, using
     a top-level dictionary with a <code>@graph</code> property can be useful for saving
-    the repetition of <code>@graph</code>. See <a href="#embedding" class="sectionRef"></a>
+    the repetition of <code>@context</code>. See <a href="#embedding" class="sectionRef"></a>
     for more.</p>
 
   <aside class="example ds-selector-tabs"