Improve Value Stream Analytics documentation

This clarifies that Value Stream Analytics exists at the project and
group levels, but the group level feature is EE-only. This also
clarifies that the 7 stages referenced are the default, and can be
customized at the group level.

doc/user/analytics/value_stream_analytics.md

@@ -12,26 +12,26 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 
 Value Stream Analytics measures the time spent to go from an
 [idea to production](https://about.gitlab.com/blog/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/#from-idea-to-production-with-gitlab)
-(also known as cycle time) for each of your projects. Value Stream Analytics displays the median time
+(also known as cycle time) for each of your projects or groups. Value Stream Analytics displays the median time
 spent in each stage defined in the process.
 
-For information on how to contribute to the development of Value Stream Analytics, see our [contributor documentation](../../development/value_stream_analytics.md).
-
 Value Stream Analytics is useful in order to quickly determine the velocity of a given
 project. It points to bottlenecks in the development process, enabling management
 to uncover, triage, and identify the root cause of slowdowns in the software development life cycle.
 
-Value Stream Analytics is tightly coupled with the [GitLab flow](../../topics/gitlab_flow.md) and
-calculates a separate median for each stage.
+For information on how to contribute to the development of Value Stream Analytics, see our [contributor documentation](../../development/value_stream_analytics.md).
+
+## Project Level Value Stream Analytics **CORE**
+
+Project Level Value Stream Analytics is available via **Project > Analytics > Value Stream**.
 
-## Overview
+## Group Level Value Stream Analytics **PREMIUM**
 
-Value Stream Analytics is available:
+From GitLab 12.9, group level Value Stream Analytics is available via **Group > Analytics > Value Stream**.
 
-- From GitLab 12.9, at the group level via **Group > Analytics > Value Stream**. **(PREMIUM)**
-- At the project level via **Project > Analytics > Value Stream**.
+## Default stages
 
-There are seven stages that are tracked as part of the Value Stream Analytics calculations.
+The stages tracked by Value Stream Analytics by default represent the [GitLab flow](../../topics/gitlab_flow.md). These stages can be customized in Group Level Value Stream Analytics.
 
 - **Issue** (Tracker)
   - Time to schedule an issue (by milestone or by adding it to an issue board)