Merge in DNS/adguard-home from 2678-json-tag to master Updates #2678. Squashed commit of the following: commit 7c272ae8830ac10b0e0154656cf472b003315349 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Feb 15 13:14:16 2021 +0300 all: doc changes commit 3c964f814f2bc92e807aad3f5bad342eb455fe28 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Feb 15 12:54:27 2021 +0300 dhcpd: fix dhcpv6 status json