Updated docs to say that 1.8.4 is required, not 1.8.2
Updated docs to say that 1.8.4 is required, not 1.8.2

git-svn-id: a649f8b53cef7d15963550bf81aeba716f52dec1@74 5fb4a865-4516-0410-ae3b-a609ddf12040

mag/ruby-prof,mag/ruby-prof