Wording improvements for Guide chapter 9

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Diff attached, changing things for this page:
https://www.netbsd.org/docs/guide/en/chap-x.html

SHA512 (chap9patch) =
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Also, I didn't fix this but...
The multiple links to xdm's man page don't work.  Compare these two links:
https://man.netbsd.org/xdm.1
https://man.netbsd.org/xdm.8
Interestingly, the xdm.1 page says XDM(8) at the top.

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