Fix broken URLs

Fix remaining broken URLs that I could find.

Change-Id: I1c21456ee1f0f4742b2c02494641a3293a4413ea
Closes-Bug: 1225093

doc/install-guide/ch_assumptions.xml

@@ -53,7 +53,7 @@
         <listitem>
             <para>The disk partitions on your cloud controller are
                 being managed by the <link
-                    xlink:href="http://docs.openstack.org/trunk/openstack-compute/admin/content/managing-volumes.html"
+                    xlink:href="http://docs.openstack.org/admin-guide-cloud/content/managing-volumes.html"
                     >Logical Volume Manager</link> (LVM).</para>
         </listitem>
         <listitem>

doc/security-guide/ch031_neutron-architecture.xml

@@ -53,7 +53,8 @@
             <para><emphasis role="bold">API network</emphasis> Exposes all OpenStack APIs, including the OpenStack Networking API, to tenants. The IP addresses on this network should be reachable by anyone on the Internet. This may be the same network as the external network, as it is possible to create a subnet for the external network that uses IP allocation ranges to use only less than the full range of IP addresses in an IP block. This network is considered the Public Security Domain.</para>
           </listitem>
 </itemizedlist>
-        <para>For additional information see the <link xlink:href="http://docs.openstack.org/grizzly/openstack-network/admin/content/arch_overview.html"><citetitle>OpenStack Networking Administration Guide</citetitle></link>.</para>
+        <para>For additional information see the <link xlink:href="http://docs.openstack.org/admin-guide-cloud/content/ch_networking.html">Networking chapter</link> in the
+	<citetitle>OpenStack Cloud Administrator Guide</citetitle>.</para>
       </section>
     </section>
   </chapter>