[3209] Added links to the Developer's guide section.

doc/guide/hooks.xml

@@ -35,7 +35,7 @@
       <para>
       The next section describes how to configure hooks libraries. If you
       are interested in writing your own hooks library, information can be
-      found in the <ulink url="http://git.kea.isc.org/~tester/kea/doxygen">Kea
+      found in the <ulink url="https://jenkins.isc.org/job/Fedora20_32_doxygen_doc/doxygen/">Kea
       Developer's Guide</ulink>.
       </para>
     </section> <!-- end Introduction -->
@@ -322,6 +322,15 @@ and may have the zero or more of the following entries:
 
         </para>
 
+        <para>As with any other hook libraries provided by ISC, internals of the
+        user_chk code are well documented. You can take a look at the  <ulink
+        url="https://jenkins.isc.org/job/Fedora20_32_doxygen_doc/doxygen/d8/db2/libdhcp_user_chk.html">Kea Developer's Guide section dedicated to the user_chk library</ulink>
+        that discusses how the code works internally. That, together with
+        our general entries in <ulink
+        url="https://jenkins.isc.org/job/Fedora20_32_doxygen_doc/doxygen/">Hooks
+        Framework section</ulink> should give you some pointers how to extend
+        this library and perhaps even write your own from scratch.</para>
+
       </section>
       <section>
         <title>Forensic Logging Hooks</title>