illumos gate

git commit 427723622c44f91d933c66b35e3de35f4ccd4669

commit  427723622c44f91d933c66b35e3de35f4ccd4669
Author: Jason King <jason.king@joyent.com>
Date:   2019-12-17T15:53:37.000Z

    12060 Convert Intro(9S) to mandoc
    12061 Convert cb_ops(9S) to mandoc
    12062 Convert buf(9S) to mandoc
    12063 Convert free_rtn(9S) to mandoc
    12064 Convert iovec(9S) to mandoc
    12065 Convert aio_req(9S) to mandoc
    12066 Convert copyreq(9S) to mandoc
    Reviewed by: Robert Mustacchi <rm@fingolfin.org>
    Approved by: Dan McDonald <danmcd@joyent.com>