[Cases] Add new sub feature privilege to prevent access to case settings

docs/getting-started/cases-req.asciidoc

@@ -1,6 +1,11 @@
 [[case-permissions]]
 = Cases prerequisites
 
+:frontmatter-description: Learn about the {kib} feature privileges required to access {elastic-sec} cases. 
+:frontmatter-tags-products: [security]
+:frontmatter-tags-content-type: [how-to] 
+:frontmatter-tags-user-goals: [configure]
+
 //To view cases, you need the {kib} space `Read` privilege for the `Security` feature. To create cases and add comments, you need the `All` {kib}
 //space privilege for the `Security` feature.
 
@@ -34,7 +39,12 @@ a|
 * **All** for the *Cases* feature under *Security*
 * **All** for the *{connectors-feature}* feature under *Management*
 
-NOTE: Roles without **All** *{connectors-feature}* feature privileges cannot create, add, delete, or modify case connectors.
+[NOTE]
+====
+Roles without **All** *{connectors-feature}* feature privileges cannot create, add, delete, or modify case connectors.
+
+By default, `All` for the *Cases* feature includes authority to delete cases and comments and edit case settings unless you customize the sub-feature privileges.
+====
 
 | Give assignee access to cases
 a|
@@ -43,12 +53,10 @@ a|
 NOTE: Before a user can be assigned to a case, they must log into {kib} at least
 once, which creates a user profile.
 
-| Give view-only access for cases | **Read** for the *Security* feature and **All** for the *Cases* feature
-
-| Give access to view and delete cases
-a| **Read** for the *Cases* feature under *Security* with the *Delete* sub-feature selected
+| Give view-only access for cases
+a| **Read** for the *Security* feature and **All** for the *Cases* feature
 
-NOTE: These privileges also enable you to delete comments and alerts from a case.
+NOTE: By default, `Read` for the *Cases* feature does not include authority to delete cases or delete alerts and comments from cases. You also cannot view or edit case settings. You can eanble these actions by customizing the sub-feature privileges.
 
 | Revoke all access to cases | **None** for the *Cases* feature under *Security*