[8.16] [Serverless][8.17][8.16]: Security – Alerts section bugs (backport #6240)

[mergify]

Fixes #6038

Serverless:

• Manage detection alerts
  • View and filter detection alerts: Updates the second bullet and makes the explanation more generic.
  • Customize the Alerts table: Fixes the incorrect field name for the Sort fields x option.
• Reduce notifications and alerts: Fixed the links to the maintenance docs and notification docs. Now, they correctly point to Serverless pages.
• View detection alert details | About: Removes the docs for the Last Alert Status Change and MITRE ATT&CK fields and updates the screenshot

ESS: (Same changes as above)

• Manage detection alerts
  • View and filter detection alerts
  • Customize the Alerts table
• View detection alert details | About

  ---

  This is an automatic backport of pull request [Serverless][8.17][8.16]: Security – Alerts section bugs  #6240 done by Mergify.

[mergify]

Cherry-pick of 0cec577 has failed:

On branch mergify/bp/8.16/pr-6240
Your branch is up to date with 'origin/8.16'.

You are currently cherry-picking commit 0cec5776.
  (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-reduce.asciidoc
	modified:   docs/detections/alerts-ui-manage.asciidoc
	modified:   docs/detections/alerts-view-details.asciidoc
	modified:   docs/detections/images/about-section-rp.png

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/serverless/alerts/alerts-ui-manage.asciidoc
	deleted by us:   docs/serverless/alerts/reduce-notifications-alerts.asciidoc
	deleted by us:   docs/serverless/alerts/view-alert-details.asciidoc
	deleted by us:   docs/serverless/images/view-alert-details/-detections-about-section-rp.png

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

[github-actions]

A documentation preview will be available soon.

• 🔨 Buildkite builds
• 📚 HTML diff
• 📙 Preview page

Request a new doc build by commenting

• Rebuild this PR: run docs-build
• Rebuild this PR and all Elastic docs: run docs-build rebuild

_{run docs-build is much faster than run docs-build rebuild. A rebuild should only be needed in rare situations.}

_{If your PR continues to fail for an unknown reason, the doc build pipeline may be broken. Elastic employees can check the pipeline status here.}