Deletion of Domain validation

Comment: to Parallel SCSI#Ultra-3.  This is a bit overly specific and detailed for Wikipedia, which is not supposed to be a |how-to guide or manual.  At the redirection target, I added a citation and slightly expanded it, so this doesn't really need to be merged.  I think the coverage would be more applicable to the Ultra-3 standard itself, which could conceivably be split off from Parallel SCSI and expanded if someone really wanted
Stance: merge
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTHOWTO)