siptrace: docs - fix siptrace control command example in the overview

(cherry picked from commit 768b0b2c1559211dbc3c5b2e01a25bac8fd2540a)

src/modules/siptrace/doc/siptrace_admin.xml

@@ -50,10 +50,10 @@
 	The tracing can be turned on/off using Kamailio <acronym>RPC</acronym> commands.
 	</para>
 	<para>
-	&ctltool; fifo sip_trace on
+	&ctltool; rpc siptrace.status on
 	</para>
 	<para>
-	&ctltool; fifo sip_trace off
+	&ctltool; rpc siptrace.status off
 	</para>
 	</section>
 	<section>