Bug#1072483: xkbvleds.1: some remarks and editorial changes for this man page

[Alan Coopersmith]

Control: tags 1072483 fixed-upstream

https://gitlab.freedesktop.org/xorg/app/xkbutils/-/commit/b563231a8a1a6183c3c7e89d0017cd1c5d126045

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