Update add-manage-exceptions.md

[bsturg]

included note that exceptions do not work with fields appended to the output such as es|ql eval statements

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• solutions/security/detect-and-alert/add-manage-exceptions.md

[florent-leborgne]

Thanks for adding the note!

I've just reviewed the wording for now.
Once we have that in place, I'd like to reformat the section to avoid piling up notes.

Let me know what you think.