Fix @direction not listed under context definition's definition

While @direction may be used in a context definition it was only listed under context definition's conditional cases not under context definition's definition.

Author: Kibubu

index.html

@@ -12299,6 +12299,7 @@ <h2>Context Definitions</h2>
     keys MUST be either <a>terms</a>, <a>compact IRIs</a>, <a>IRIs</a>,
     or one of the <a>keywords</a>
     <code>@base</code>,
+    <code class="changed">@direction</code>,
     <code class="changed">@import</code>,
     <code>@language</code>,
     <code class="changed">@propagate</code>,