Fix typo.
--- a/spec/latest/json-ld-api/index.html	Wed Feb 13 15:45:24 2013 -0500
+++ b/spec/latest/json-ld-api/index.html	Wed Feb 13 15:46:54 2013 -0500
@@ -4683,7 +4683,7 @@
         <dd>The URL of the remote context to retrieve.</dd>
         <dt>ContextRetrievalCallback callback</dt>
         <dd>The callback that is called when the remote context has been
-          successfully retrieved or an error preventing it's retrieval has been
+          successfully retrieved or an error preventing its retrieval has been
           detected.</dd>
       </dl>
     </section>