[filebeat] Document winlog input and make config on par with winlogbeat

[marc-gr]

Proposed commit message

• Document the winlog input

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
  - [] I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

Related issues

• Relates [meta] Deprecate winlogbeat in favor of filebeat winlog input. #40074

[elasticmachine]

Pinging @elastic/sec-windows-platform (Team:Security-Windows Platform)

[marc-gr]

Made the suggested change cc @andrewkroh

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feat/document-winlog-input upstream/feat/document-winlog-input
git merge upstream/main
git push upstream feat/document-winlog-input