[DOCS] fix sentence in monitoring.asciidoc

Relates to #32097

Author: javanna

x-pack/docs/en/security/tribe-clients-integrations/monitoring.asciidoc

@@ -2,7 +2,7 @@
 === Monitoring and Security
 
 <<xpack-monitoring, {monitoring}>> consists of two components: an agent
-that you install on on each {es} and Logstash node, and a Monitoring UI
+that you install on each {es} and Logstash node, and a Monitoring UI
 in {kib}. The monitoring agent collects and indexes metrics from the nodes
 and you visualize the data through the Monitoring dashboards in {kib}. The agent
 can index data on the same {es} cluster, or send it to an external