siptrace: docs - fixed small typo

(cherry picked from commit 7d846f928b75a3bc1b8e8c1a70e39bfede939c15)

src/modules/siptrace/doc/siptrace_admin.xml

@@ -587,7 +587,7 @@ modparam("siptrace", "trace_init_mode", 1)
 				</listitem>
 				<listitem>
 				<para>
-				4 (3rd bit set) - mirro the traffic to the SIP URI specified by
+				4 (3rd bit set) - mirror the traffic to the SIP URI specified by
 				duplicate_uri.
 				</para>
 				</listitem>