Add clarifying note to @context section about JSON-LD processing.

Author: brentzundel

index.html

@@ -982,7 +982,18 @@ <h3>Contexts</h3>
 the context.
           </dd>
         </dl>
-
+        <p class="note">
+Though this specification requires that a <code>@context</code> <a>property</a>
+be present, there is no requirement that the value of the <code>@context</code>
+property be processed using JSON-LD. This is to support processing using plain
+JSON libraries such as those that may be used when the
+<a>verifiable credential</a> is encoded as a JWT.
+JSON-LD aware processors can process the <code>@context</code> using full
+JSON-LD processing as expected. For other processors, the only processing
+necessary is to ensure that the order of the values in <code>@context</code>
+is what is expected for the particular application, but no JSON-LD processing
+of those values is required.
+        </p>
         <pre class="example nohighlight" title="Usage of the @context property">
 {
   <span class="highlight">"@context": [