[Auditbeat] improve docs for exclude_files option of file_integrity

[nicozanf]

-- Type of change

• Docs

What does this PR do?

The exclude_files option can be used for excluding directories, too, if recursive is set to true. Also (after spending hours on it) I've added a working example of a folder exclusion for Windows.

Why is it important?

It seems not documented elsewhere ;-)

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.

Author's Checklist

[cla-checker-service]

💚 CLA has been signed

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• Start Time: 2023-06-19T21:09:55.886+0000

• Duration: 5 min 47 sec

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[nicozanf]

/test

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @nicozanf? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

Pinging @elastic/sec-linux-platform (Team:Security-Linux Platform)

[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 patch-1 upstream/patch-1
git merge upstream/main
git push upstream patch-1

[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 patch-1 upstream/patch-1
git merge upstream/main
git push upstream patch-1