Correct modgroup usage

jsc#DOCTEAM-2046

Author: tahliar

xml/ha_managing_resources.xml

@@ -226,9 +226,9 @@ primitive admin_addr IPaddr2 \
  <sect2 xml:id="sec-conf-crm-manage-edit">
   <title>Editing groups with &crmsh;</title>
   <para>
-   To change the order of a group member, use the <command>modgroup</command> command
+   To add a resource to the group, use the <command>modgroup</command> command
    from the <command>configure</command> subcommand. For example, use the following
-   command to move the primitive <literal>Email</literal> before <literal>Public-IP</literal>:
+   command to add the primitive <literal>Email</literal> before <literal>Public-IP</literal>:
   </para>
 <screen>&prompt.crm.conf;<command>modgroup g-mailsvc add Email before Public-IP</command></screen>
   <para>