Adds dataset (#20162)

Author: angelampcosta

src/content/docs/logs/log-explorer.mdx

@@ -32,6 +32,7 @@ At the account level, the datasets available are:
 - [Gateway DNS](/logs/reference/log-fields/account/gateway_dns/) (`FROM gateway_dns`)
 - [Gateway HTTP](/logs/reference/log-fields/account/gateway_http/) (`FROM gateway_http`)
 - [Gateway Network](/logs/reference/log-fields/account/gateway_network/) (`FROM gateway_network`)
+- [Zero Trust Network Session Logs](/logs/reference/log-fields/account/zero_trust_network_sessions/) (`FROM zero_trust_network_sessions`)
 
 ## Authentication