It does not specify them becuase they are not included – VxRail does not ship with SFP+ cables – they are specific to each switch type and are best provided separately so that they match.  They should come with the switch or from the switch vendor. 
Hello Experts,  We have a lot of questions on SFP+ Part number to be ordered from Myquotes for VxRail. My quotes gives INSTLKIT-10GE-SFP+ . However the BOM for this doesn't specify whether it includes the SFP+.Can somebody please help us clear this doubt?  Thanks, Virender Singh
VxRail SFP+ partnumber