etdump.1: Polish + xref cd9660(4)

[ziaee]

Summary

+ correct misfile in section 8
+ rewrite the document descirption to include -9660
+ markup command modifiers as such instead of bold
+ markup variables as defined variables, enabling apropos
+ correct option syntax in description section
+ unwrap list offsets for legibility
+ fix line wrapping for standard BSD console
+ crossreference cd9660(4) and vis versa
+ tag SPDX for both manuals

MFC after: 3 days

[mhorne]

From where are you getting your line-wrap rules? style.mdoc(5) is silent on this, but the existing tendency is to wrap single sentences at 80 characters (the source code limit declared by style(9)), and of course follow the one-line-per-sentence rule (although some man pages break lines semantically).

Wrapping at 50 characters is not necessary.

[ziaee]

I'm not wrapping at 50. I wrap at 72 for compatiblity with the bsd text editor, vi, on the standard bsd console (80). The reason I wrap them a little before 72 is break them in the least awkward place grammatically.

[ziaee]

You are right sir, one of my lines certainly should be combined.
Please excuse the delay.

[mhorne]

Approved.