[8.14](backport #4926) [Observability Docs] Replace placeholder URLs

[mergify]

Contributes to elastic/docs-content#1806 and updates example links to avoid security threat.

---

This is an automatic backport of pull request #4926 done by Mergify.

[mergify]

Cherry-pick of 5b5a5c9 has failed:

On branch mergify/bp/8.14/pr-4926
Your branch is up to date with 'origin/8.14'.

You are currently cherry-picking commit 5b5a5c9a.
  (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/en/observability/apm/command-reference.asciidoc
	modified:   docs/en/observability/apm/https.asciidoc
	modified:   docs/en/observability/apm/monitoring/monitoring-internal-collection.asciidoc
	modified:   docs/en/observability/apm/otel-direct.asciidoc
	modified:   docs/en/observability/apm/shared-ssl-logstash-config.asciidoc
	modified:   docs/en/observability/apm/tab-widgets/install-agents.asciidoc
	modified:   docs/en/observability/ci-cd-observability.asciidoc
	modified:   docs/en/observability/logs-ecs-application.asciidoc
	modified:   docs/en/observability/logs-plaintext.asciidoc
	modified:   docs/en/observability/logs-stream.asciidoc
	modified:   docs/en/observability/logs-troubleshooting.asciidoc
	modified:   docs/en/observability/monitor-java-app.asciidoc
	modified:   docs/en/observability/synthetics-configuration.asciidoc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/en/observability/apm/configure/outputs/elasticsearch.asciidoc
	both modified:   docs/en/observability/profiling-self-managed-ops.asciidoc

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.}