[8.x] [Serverless][8.17] Cases subfeatures (backport #6288) (#6359)

* [Serverless][8.17] Cases subfeatures (#6288)

(cherry picked from commit b445b87)

# Conflicts:
#	docs/serverless/investigate/case-permissions.asciidoc

* Delete docs/serverless directory and its contents

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Co-authored-by: Nastasha Solomon <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

docs/cases/cases-req.asciidoc

@@ -54,7 +54,7 @@ once, which creates a user profile.
 | Give view-only access for cases
 a| **Read** for the *Security* feature and **All** for the *Cases* feature
 
-NOTE: You can customize the sub-feature privileges to allow access to deleting cases, deleting alerts and comments from cases, and viewing or editing case settings.
+NOTE: You can customize the sub-feature privileges to allow access to deleting cases, deleting alerts and comments from cases, viewing or editing case settings, adding case comments and attachments, and re-opening cases.   
 
 | Revoke all access to cases | **None** for the *Cases* feature under *Security*