[domain] updated docs

Added new "subdomain_col" mod param

Author: bogdan-iancu

modules/domain/doc/domain_admin.xml

@@ -120,6 +120,23 @@ modparam("domain", "domain_col", "domain_name")
 		<title>Setting attrs_col parameter</title>
 		<programlisting format="linespecific">
 modparam("domain", "attrs_col", "attributes")
+</programlisting>
+		</example>
+	</section>
+	<section>
+		<title><varname>subdomain_col</varname> (int)</title>
+		<para>
+		Name of the "accept_subdomain" column in the domain table.
+		A positive value for the column means the domain accepts subdomains.
+		A 0 value means it does not.
+		</para>
+		<para>
+		Default value is <quote>accept_subdomain</quote>.
+		</para>
+		<example>
+		<title>Setting subdomain_col parameter</title>
+		<programlisting format="linespecific">
+modparam("domain", "subdomain_col", "has_subdomain")
 </programlisting>
 		</example>
 	</section>