Added endgame-* index and new heading 3 Elastic Endpoint SMP. (#51071)

Author: jmikell821

docs/siem/index.asciidoc

@@ -24,7 +24,7 @@ Kibana provides step-by-step instructions to help you add data. The
 detailed information and instructions.
 
 [float]
-=== {Beats} 
+=== {Beats}
 
 https://www.elastic.co/products/beats/auditbeat[{auditbeat}],
 https://www.elastic.co/products/beats/filebeat[{filebeat}],
@@ -33,9 +33,14 @@ https://www.elastic.co/products/beats/packetbeat[{packetbeat}]
 send security events and other data to Elasticsearch.
 
 The default index patterns for SIEM events are `auditbeat-*`, `winlogbeat-*`,
-`filebeat-*`, and `packetbeat-*``. You can change the default index patterns in
+`filebeat-*`, `endgame-*`, and `packetbeat-*``. You can change the default index patterns in
 *Kibana > Management > Advanced Settings > siem:defaultIndex*.
 
+[float]
+=== Elastic Endpoint Sensor Management Platform
+
+The Elastic Endpoint Sensor Management Platform (SMP) ships host and network events directly to the SIEM application, and is fully ECS compliant.
+
 [float]
 === Elastic Common Schema (ECS) for normalizing data