Add event.is_silenced and event.check.is_silenced field selectors (#2380)
Add event.is_silenced and event.check.is_silenced field selectors (#2380)

* Add event.is_silenced and event.check.is_silenced field selectors

* Update content/sensu-go/5.20/api/overview.md
sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs