Ainar Garipov 59f48d7929 Pull request: client: imp private dns resolver docs
Updates #3028.

Squashed commit of the following:

commit a44f1b76a2d659a96b485906c933b239f6d109d9
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 29 17:36:20 2021 +0300

    client: imp private dns resolver docs
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