Pull request: imp-cache-label

Merge in DNS/adguard-home from imp-cache-label to master

Squashed commit of the following:

commit 10f62aa078b5306525578e22476835ee2e7bac66
Merge: 08c2de0e fe8be370
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 4 16:30:43 2022 +0300

    Merge branch 'master' into imp-cache-label

commit 08c2de0edbb1138b47d1a02d6630aa99b7ddcec9
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 4 16:19:36 2022 +0300

    client: imp label

commit e66fbbe3cc6f929ff26fe3d7b8e14acc95f5c0ff
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 4 16:17:15 2022 +0300

    client: imp upstream example

commit d073f71cc5df4ba5f7de7ed08ad1215f7a198539
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 4 15:44:58 2022 +0300

    client: imp upstreams

commit b78d06db645a9f496bed699f4d4bf8c7396148f3
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 4 14:59:30 2022 +0300

    client: imp cache size label

CHANGELOG.md

@@ -49,7 +49,7 @@ experimental and may break or change in the future.
   explicitly enabled by setting the new property `dns.serve_http3` in the
   configuration file to `true`.
 - DNS-over-HTTP upstreams can now upgrade to HTTP/3 if the new configuration
-  file property `use_http3_upstreams` is set to `true`.
+  file property `dns.use_http3_upstreams` is set to `true`.
 - Upstreams with forced DNS-over-HTTP/3 and no fallback to prior HTTP versions
   using the `h3://` scheme.