#7076: mention SystemRandom class near start of the module docs; reword change description for clarity.  Noted by Shawn Ligocki.
#7076: mention SystemRandom class near start of the module docs; reword change description for clarity.  Noted by Shawn Ligocki.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator