Update final text strings & readthedoc URL

TNL-401

common/lib/xmodule/xmodule/course_module.py

@@ -266,7 +266,7 @@ class CourseFields(object):
     )
     cohort_config = Dict(
         display_name=_("Cohort Configuration"),
-        help=_("Cohorts are not currently supported by edX."),
+        help=_("Enter policy keys and values to enable the cohort feature, define automated student assignment to groups, or identify any course-wide discussion topics as private to cohort members."),
         scope=Scope.settings
     )
     is_new = Boolean(

lms/templates/instructor/instructor_dashboard_2/cohort-editor.underscore

@@ -17,10 +17,11 @@
         <div class="setup-value">
             <% if (cohort.get('assignment_type') == "none") { %>
                 <%= gettext("Students are added to this group only when you provide their email addresses or usernames on this page.") %>
+                <a href="http://edx.readthedocs.org/projects/edx-partner-course-staff/en/latest/cohorts/cohort_config.html#assign-students-to-cohort-groups-manually" class="incontext-help action-secondary action-help"><%= gettext("What does this mean?") %></a>
             <% } else { %>
                 <%= gettext("Students are added to this group automatically.") %>
+                <a href="http://edx.readthedocs.org/projects/edx-partner-course-staff/en/latest/cohorts/cohorts_overview.html#all-automated-assignment" class="incontext-help action-secondary action-help"><%= gettext("What does this mean?") %></a>
             <% } %>
-            <a href="http://edx.readthedocs.org" class="incontext-help action-secondary action-help"><%= gettext("What does this mean?") %></a>
         </div>
         <div class="setup-actions">
             <% if (advanced_settings_url != "None") { %>