Add definition for an included block.

Author: gkellogg

common/terms.html

@@ -225,6 +225,9 @@
     A <a>named graph</a> created from the value of a <a>map entry</a>
     having an <a>expanded term definition</a>
     where <code>@container</code> is set to  <code>@graph</code>.</dd>
+  <dt class="changed"><dfn data-cite="JSON-LD11#dfn-included-block">included block</dfn></dt><dd class="changed">
+    An <a>included block</a> is an <a>entry</a> in a <a>node object</a> where the key is `@included` or an alias
+    and the value is one ore more <a>node objects</a>.</dd>
   <dt><dfn data-cite="JSON-LD11#dfn-index-map">index map</dfn></dt><dd>
     An <a>index map</a> is a <a>map</a> value of a <a>term</a>
     defined with <code>@container</code> set to <code>@index</code>,