Add regex_id field of the query table

[DL6ER]

What does this implement/fix?

Documentation change accompanying pi-hole/FTL#1607

Related issue or feature (if applicable): This is the docs change

Pull request in docs with documentation (if applicable): N/A

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[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[DL6ER]

Rebased to target release/v6.0

[github-actions]

Conflicts have been resolved.

[yubiuser]

There are multiple sections about the additional_info column on this page. Maybe we should add a note that some of the data is now in regex_id.

[DL6ER]

It is in both, there is no change to the existing additional_info column.