usrloc: Update documentation concerning xavp_contact parameter

- Note that tm xavp_contact parameter must match

modules/usrloc/README

@@ -807,8 +807,10 @@ modparam("usrloc", "timer_procs", 4)
 
 3.34. xavp_contact (string)
 
-   The name of XAVP storring the attributes per contact. They are saved in
-   location record and restored at lookup.
+   The name of XAVP storing the attributes per contact. They are saved in
+   location record and restored at lookup. The tm module parameter
+   xavp_contact must also be set to the same value to use the
+   t_load_contacts and t_next_contacts functions.
 
    Default value is "NULL".
 

modules/usrloc/doc/usrloc_admin.xml

@@ -895,8 +895,10 @@ modparam("usrloc", "timer_procs", 4)
 	<section id="usrloc.p.xavp_contact">
 		<title><varname>xavp_contact</varname> (string)</title>
 		<para>
-		The name of XAVP storring the attributes per contact. They are saved
-		in location record and restored at lookup.
+		The name of XAVP storing the attributes per contact. They are saved
+		in location record and restored at lookup. The tm module parameter
+		<varname>xavp_contact</varname> must also be set to the same value to use the
+		<varname>t_load_contacts</varname> and <varname>t_next_contacts</varname> functions.
 		</para>
 		<para>
 		<emphasis>