GITBOOK-23: Fix incorrect parameter in SIEM example

advanced/siem.md

@@ -35,7 +35,7 @@ docker run -d -p 8000:8000 -p 9443:9443 \
     -v /var/run/docker.sock:/var/run/docker.sock \
     -v portainer_data:/data \
     portainer/portainer-ee:lts \
-    --syslog-addr=syslog.mydomain.com \
+    --syslog-address=syslog.mydomain.com \
     --syslog-port=514 \
     --syslog-source-hostname="my-portainer-instance"
 ```