[8.16](backport #46303) [docs] [asciidoc] Replace placeholder URLs

[mergify]

Contributes to elastic/docs-content#1734, elastic/docs-content#1801

Replaces placeholder URLs with those reserved by the Internet Engineering Task Force (IETF) in RFC 2606 and RFC 6761 (e.g. example.com, example.net, example.org, example.edu, .example).

---

This is an automatic backport of pull request #46303 done by Mergify.

[mergify]

Cherry-pick of 51c3ca9 has failed:

On branch mergify/bp/8.16/pr-46303
Your branch is up to date with 'origin/8.16'.

You are currently cherry-picking commit 51c3ca9bc.
  (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:   auditbeat/docs/fields.asciidoc
	modified:   auditbeat/include/fields.go
	modified:   filebeat/docs/fields.asciidoc
	modified:   filebeat/include/fields.go
	modified:   heartbeat/docs/fields.asciidoc
	modified:   heartbeat/docs/monitors/monitor-http.asciidoc
	modified:   heartbeat/include/fields.go
	modified:   libbeat/_meta/fields.ecs.yml
	modified:   libbeat/docs/shared-ssl-logstash-config.asciidoc
	modified:   metricbeat/docs/fields.asciidoc
	modified:   metricbeat/include/fields/fields.go
	modified:   packetbeat/docs/fields.asciidoc
	modified:   packetbeat/include/fields.go
	modified:   winlogbeat/docs/fields.asciidoc
	modified:   x-pack/filebeat/docs/inputs/input-httpjson.asciidoc
	modified:   x-pack/filebeat/processors/decode_cef/_meta/fields.yml
	modified:   x-pack/filebeat/processors/decode_cef/fields.go
	modified:   x-pack/heartbeat/include/fields.go
	modified:   x-pack/osquerybeat/docs/fields.asciidoc
	modified:   x-pack/osquerybeat/include/fields.go
	modified:   x-pack/winlogbeat/module/sysmon/ingest/sysmon.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   winlogbeat/include/fields.go
	both modified:   x-pack/filebeat/docs/inputs/input-aws-s3.asciidoc
	both modified:   x-pack/filebeat/docs/inputs/input-streaming.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

[botelastic]

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