It's [ec2authtoken]

Fix section name.

Change-Id: I76c048c6f87cf202d72b9fee943df5a8677118a8
Closes-Bug: #1295739

doc/install-guide/section_heat-install.xml

@@ -107,7 +107,7 @@ rabbit_password = <replaceable>RABBIT_PASS</replaceable></programlisting>
     <step>
       <para>Edit the <filename>/etc/heat/heat.conf</filename> file to
         change the <literal>[keystone_authtoken]</literal> and
-          <literal>[ec2_authtoken]</literal> sections to add
+          <literal>[ec2authtoken]</literal> sections to add
         credentials to the Orchestration Service:</para>
       <programlisting language="ini">[keystone_authtoken]
 auth_host = controller
@@ -117,7 +117,7 @@ auth_uri = http://<replaceable>controller</replaceable>:5000/v2.0
 admin_tenant_name = service
 admin_user = heat
 admin_password = <replaceable>HEAT_PASS</replaceable>
-[ec2_authtoken]
+[ec2authtoken]
 auth_uri = http://<replaceable>controller</replaceable>:5000/v2.0
 keystone_ec2_uri = http://<replaceable>controller</replaceable>:5000/v2.0/ec2tokens</programlisting>
     </step>