[Docs][Cases]7.9 Cases updates (#64)

* starts 7.9 updates

* updates actions api

* finalises API

* updates UI

* typo

* fixes screenshot

* corrections

* adds sn field

* adds breaking changes section

* now adds file

* title change

* corrects breaking changes

* corrections

Author: benskelker

docs/breaking-changes.asciidoc

@@ -0,0 +1,17 @@
+[chapter]
+[[breaking-changes]]
+= Breaking changes
+
+[discrete]
+== 7.9 Release
+
+[discrete]
+=== Actions API
+
+When you <<register-connector, create a {sn} connector>> via the Actions API:
+
+* The `casesConfiguration` object is obsolete. Instead, use
+`incidentConfiguration`.
+* To see {sn} connectors in the UI, you must use the `isCaseOwned` field.
+
+IMPORTANT: These changes only apply to {sn} connectors.

docs/index.asciidoc

@@ -1,9 +1,13 @@
 :doctype:      book
-:siem-soln:    Elastic Security
-:siem-app:     Elastic Security app
-:siem-ui:      Elastic Security UI
+:es-sec:       Elastic Security
+:es-sec-app:   Elastic Security app
+:es-sec-ui:    Elastic Security UI
+:siem-soln:    {es-sec}
+:siem-app:     {es-sec-app}
+:siem-ui:      {es-sec-ui}
 :ml-dir:       {stack-docs-root}/docs/en/stack/ml
 :sn: ServiceNow
+:ibm-r: IBM Resilient
 
 [[elastic-endpoint]]
 = Elastic Endpoint Security
@@ -27,3 +31,5 @@ include::siem-apis.asciidoc[]
 
 include::siem/reference/ref-index.asciidoc[]
 
+include::breaking-changes.asciidoc[]
+