[Docs]7.7 SIEM doc updates (elastic#63951)

* SIEM section doc updates

* corrections

* more corrections

docs/management/advanced-options.asciidoc

@@ -218,6 +218,8 @@ might increase the search time. This setting is off by default. Users must opt-i
 [horizontal]
 `siem:defaultAnomalyScore`:: The threshold above which Machine Learning job anomalies are displayed in the SIEM app.
 `siem:defaultIndex`:: A comma-delimited list of Elasticsearch indices from which the SIEM app collects events.
+`siem:ipReputationLinks`:: A JSON array containing links for verifying the reputation of an IP address. The links are displayed on
+{siem-guide}/siem-ui-overview.html#network-ui[IP detail] pages.
 `siem:enableNewsFeed`:: Enables the security news feed on the SIEM *Overview*
 page.
 `siem:newsFeedUrl`:: The URL from which the security news feed content is

docs/siem/siem-ui.asciidoc

@@ -35,7 +35,7 @@ image::siem/images/network-ui.png[]
 
 [float]
 [[detections-ui]]
-=== Detections (Beta)
+=== Detections (beta)
 
 The Detections feature automatically searches for threats and creates 
 signals when they are detected. Signal detection rules define the conditions 
@@ -50,6 +50,22 @@ or the Detections API.
 [role="screenshot"]
 image::siem/images/detections-ui.png[]
 
+[float]
+[[cases-ui]]
+=== Cases (beta)
+
+Cases are used to open and track security issues directly in SIEM. 
+Cases list the original reporter and all users who contribute to a case
+(`participants`). Case comments support Markdown syntax, and allow linking to
+saved Timelines. Additionally, you can send cases to external systems from
+within SIEM (currently ServiceNow).
+
+For information about opening, updating, and closing cases, see
+{siem-guide}/cases-overview.html[Cases] in the SIEM Guide.
+
+[role="screenshot"]
+image::siem/images/cases-ui.png[]
+
 [float]
 [[timelines-ui]]
 === Timeline