Fixes DOC-841 per multiple requests

@stroilova @shnayder please verify that I have updated these files
correctly. @catong complete the thread started in email.

common/lib/xmodule/xmodule/capa_base.py

@@ -143,9 +143,10 @@ class CapaFields(object):
     )
     rerandomize = Randomization(
         display_name=_("Randomization"),
-        help=_("Defines how often inputs are randomized when a student loads the problem. "
-               "This setting only applies to problems that can have randomly generated numeric values. "
-               "A default value can be set in Advanced Settings."),
+        help=_(
+            'Defines when to randomize the variables specified in the associated Python script. '
+            'For problems that do not randomize values, specify \"Never\". '
+        ),
         default=RANDOMIZATION.NEVER,
         scope=Scope.settings,
         values=[

common/lib/xmodule/xmodule/modulestore/inheritance.py

@@ -98,7 +98,12 @@ class InheritanceMixin(XBlockMixin):
     )
     rerandomize = String(
         display_name=_("Randomization"),
-        help=_("Specify how often variable values in a problem are randomized when a student loads the problem. Valid values are \"always\", \"onreset\", \"never\", and \"per_student\". This setting only applies to problems that have randomly generated numeric values."),
+        help=_(
+            'Specify the default for how often variable values in a problem are randomized. '
+            'This setting should be set to \"never\" unless you plan to provide a Python '
+            'script to identify and randomize values in most of the problems in your course. '
+            'Valid values are \"always\", \"onreset\", \"never\", and \"per_student\".'
+        ),
         scope=Scope.settings,
         default="never",
     )