fixed typo

index.html

@@ -11136,7 +11136,7 @@ <h2>Type Maps</h2>
       <a>terms</a>,
       or the <a>keyword</a> <code>@none</code>,
       and the values MUST be <a>node objects</a>
-      or <a>strings</a> which expand to node obects.</p>
+      or <a>strings</a> which expand to <a>node objects</a>.</p>
 
     <p>If the value contains a property expanding to <code>@type</code>, and it's value
       is contains the referencing key after suitable expansion of both the referencing key