The new comment:
> A WordPress Commenter <!wapuu@wordpress.example>:
>
> Hi, this is a comment.
> To moderate comments, just log in. There you will have the option to edit or delete them.
> Commenter avatars come from <a href="!https://gravatar.com">Gravatar</a>.
Also introduces a network setting to set the email address of the first comment author on a new site.
Props Ipstenu, rachelbaker, jorbin, jeremyfelt.
Fixes#36702, #14268.
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