plugin/bind: Point to MacOS bug
Document this is a bug.
Closes: 4993
@@ -101,3 +101,6 @@ bad.example.com {
forward . 5.6.7.8
}
```
+
+Also on MacOS there is an (open) bug where this doesn't work properly. See
+<https://github.com/miekg/dns/issues/724> for details, but no solution.
