Install Guide: cinder setup for ceilometer fixes

* openstack-cinder-volume should be restarted, not
  openstack-cinder-agent-central
* use 'ceilometer' instead of 'cinder' in the section id

Change-Id: Id9cbab26ed8aa9d09b98da93576ff7aad8c304b7
Closes-Bug: #1259456
backport: havana

doc/install-guide/section_ceilometer-cinder.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<section xml:id="cinder-install-cinder"
+<section xml:id="ceilometer-install-cinder"
   xmlns="http://docbook.org/ns/docbook"
   xmlns:xi="http://www.w3.org/2001/XInclude"
   xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
@@ -27,7 +27,7 @@ notification_driver = cinder.openstack.common.notifier.rpc_notifier</programlist
         <screen os="ubuntu;debian"><prompt>#</prompt> <userinput>service cinder-volume restart</userinput>
 <prompt>#</prompt> <userinput>service cinder-api restart</userinput></screen>
         <screen os="rhel;fedora;centos;sles;opensuse"><prompt>#</prompt> <userinput>service openstack-cinder-api restart</userinput>
-<prompt>#</prompt> <userinput>service openstack-cinder-agent-central restart</userinput></screen>
+<prompt>#</prompt> <userinput>service openstack-cinder-volume restart</userinput></screen>
     </step>
   </procedure>
 </section>