[8.15] [DE Team][8.15][Serverless] Bulk-update a rule's custom highlighted fields (backport #5460)

[mergify]

Fixes #5090

ESS previews:

• Manage detection rules | Modify existing rules settings: Added bullet to the second item in step 2
• BulkEditAction object | Possible BulkEditAction object values: Added the following params for bulk-updating custom highlighted fields:
  • add_investigation_fields
  • delete_investigation_fields
  • set_investigation_fields
• Create a detection rule | Configure advanced rule settings: Minor revisions to the description
• View detection alert details | Investigation: Expanded on the Highlighted fields description

Serverless previews: (Same changes, minus API updates)

• Manage detection rules | Modify existing rules settings
• Create a detection rule | Configure advanced rule settings
• View detection alert details | Investigation

---

This is an automatic backport of pull request #5460 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of cfac679 has failed:

On branch mergify/bp/8.15/pr-5460
Your branch is up to date with 'origin/8.15'.

You are currently cherry-picking commit cfac6796.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/detections/alerts-view-details.asciidoc
	modified:   docs/detections/api/rules/rules-api-bulk-actions.asciidoc
	modified:   docs/detections/rules-ui-create.asciidoc
	modified:   docs/detections/rules-ui-manage.asciidoc

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/serverless/alerts/view-alert-details.mdx
	deleted by us:   docs/serverless/rules/rules-ui-create.mdx
	deleted by us:   docs/serverless/rules/rules-ui-management.mdx

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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