Add a section about OpenStack distribution packages

Since many users are using distribution packages, let's give
some quick pointers to the distribution start pages.

Change-Id: I1843e278ac1757961092ee171ffc81aaf2da7426

doc/common/app_support.xml

@@ -307,4 +307,46 @@ xlink:href="https://bugs.launchpad.net/ceilometer"
                 xlink:href="https://wiki.openstack.org/wiki/IRC"
                 >https://wiki.openstack.org/wiki/IRC</link>.</para>
     </section>
-</appendix>
+    <section xml:id="support-documentation-feedback">
+      <title>Documentation feedback</title>
+
+        <para>To provide feedback on documentation, join and use the
+           <email>openstack-docs@lists.openstack.org</email>
+           mailing list at <link
+           xlink:href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs"
+           >OpenStack Documentation Mailing List</link>,
+           or <link
+           xlink:href="https://bugs.launchpad.net/openstack-manuals/+filebug"
+           >report a bug</link>.
+        </para>
+    </section>
+
+    <section xml:id="distro-support">
+      <title>OpenStack distribution packages</title>
+      <para>
+        The following Linux distributions provide community-supported packages for
+        OpenStack:
+      </para>
+      <itemizedlist>
+        <listitem>
+          <para><emphasis role="bold">CentOS, Fedora, and Red Hat
+          Enterprise Linux:</emphasis> <link
+          xlink:href="http://openstack.redhat.com/">http://openstack.redhat.com/</link>
+          </para>
+        </listitem>
+        <listitem>
+          <para><emphasis role="bold">openSUSE and SUSE Linux
+          Enterprise Server:</emphasis>
+          <link xlink:href="http://en.opensuse.org/Portal:OpenStack"
+          >http://en.opensuse.org/Portal:OpenStack</link>
+          </para>
+        </listitem>
+        <listitem>
+          <para><emphasis role="bold">Ubuntu:</emphasis>
+          <link xlink:href="https://wiki.ubuntu.com/ServerTeam/CloudArchive"
+          >https://wiki.ubuntu.com/ServerTeam/CloudArchive</link>
+          </para>
+        </listitem>
+      </itemizedlist>
+    </section>
+ </appendix>