Aother minor tweak to context processing overview.

Author: gkellogg

spec/latest/json-ld-api/index.html

@@ -808,9 +808,9 @@ <h3>Overview</h3>
         this algorithm ensuring that there is no cyclical reference.</p>
 
       <p>If <a>context</a> is a <a class="changed">dictionary</a>, we first update the
-        <a>base IRI</a>, the <a>vocabulary mapping</a>, and the
+        <a>base IRI</a>, the <a>vocabulary mapping</a>, <a>processing mode</a>, and the
         <a>default language</a> by processing three specific keywords:
-        <code>@base</code>, <code>@vocab</code>, and <code>@language</code>.
+        <code>@base</code>, <code>@vocab</code>, <code>@version</code>, and <code>@language</code>.
         These are handled before any other keys in the <a>local context</a> because
         they affect how the other keys are processed. Please note that <code>@base</code> is
         ignored when processing remote contexts.</p>