Merge pull request #5642 from edx/markhoeber-doc1123

Updated max attempts advanced settings help string

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

@@ -126,7 +126,7 @@ class InheritanceMixin(XBlockMixin):
     )
     max_attempts = Integer(
         display_name=_("Maximum Attempts"),
-        help=_("Enter the maximum number of times a student can try to answer problems. This is a course-wide setting, but you can specify a different number when you create an individual problem. To allow unlimited attempts, enter null."),
+        help=_("Enter the maximum number of times a student can try to answer problems. By default, Maximum Attempts is set to null, meaning that students have an unlimited number of attempts for problems. You can override this course-wide setting for individual problems. However, if the course-wide setting is a specific number, you cannot set the Maximum Attempts for individual problems to unlimited."),
         values={"min": 0}, scope=Scope.settings
     )
     matlab_api_key = String(