Comment on "DNS rewrites"

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to request a feature or enhancement and not ask a question

### The problem

Hi,
it would be very nice if we could add a comment (even a short one) on each DNS rewrites rules...
sometimes it's useful to know why we've added this or that rule.

thanks all,
have fun.

Bye David

### Proposed solution

just add a new filed with the DNS rewrite rules.
(we know 'just' could be sometimes not so easy)

### Alternatives considered and additional information

_No response_