Bug#1072470: xhost.1: some remarks and editorial changes for this man page

[Alan Coopersmith]

Control: tags 1072470 fixed-upstream

https://gitlab.freedesktop.org/xorg/app/xhost/-/commit/1bf855ea7819c80f6cacacdedfac99c1a0c067ba

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        -Alan Coopersmith-                 alan.coopersm...@oracle.com
         Oracle Solaris Engineering - https://blogs.oracle.com/solaris