[BUG][7.17-8.5]Fix note that describes how exceptions work with EQL rules (backport #4759)

[mergify]

This is an automatic backport of pull request #4759 done by Mergify.
Cherry-pick of 7d74705 has failed:

On branch mergify/bp/7.17/pr-4759
Your branch is up to date with 'origin/7.17'.

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Unmerged paths:
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	both modified:   docs/detections/detections-ui-exceptions.asciidoc

no changes added to commit (use "git add" and/or "git commit -a")

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

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