Release verification instructions

[Kathey Marsden]

I noticed today the 10.5.3.0 release download page is missing the 
download verification instructions.  I seem to recall this getting 
dropped off at some point before, so thought I would mention it. I am 
not sure if this is something that is supposed to be in the release 
notes or is added later. I don't see it in the 10.6.1.0 release notes, 
but that just could be because it is not yet time.

Kathey