[eventLog][docs] updates README.md (#92563)

resolves #89998 The README.md for the event log was a bit old, and was more focused on implementation details and information for plugin developers writing events. There wasn't much information available that was useful for folks using the event log for problem diagnosis. So the docs have been updated a bit in general, and more information has been added on the event document structure, and the actions and alerts events specifically.
elastic · Mar 5, 2021 · 1c4c7c2 · 1c4c7c2
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diff --git a/docs/developer/plugin-list.asciidoc b/docs/developer/plugin-list.asciidoc
@@ -367,9 +367,8 @@ security and spaces filtering as well as performing audit logging.
 
 
 |{kib-repo}blob/{branch}/x-pack/plugins/event_log/README.md[eventLog]
-|The purpose of this plugin is to provide a way to persist a history of events
-occuring in Kibana, initially just for the Make It Action project - alerts
-and actions.
+|The event log plugin provides a persistent history of alerting and action
+actitivies.
 
 
 |{kib-repo}blob/{branch}/x-pack/plugins/features/README.md[features]