Update feature flag name for Cycle Analytics

https://gitlab.com/gitlab-org/gitlab-ee/issues/14671

doc/user/analytics/cycle_analytics.md

 # Cycle Analytics
 > - Introduced prior to GitLab 12.2 at the project level.
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/12077) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.2 at the group level (enabled by feature flag `analytics`).
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/12077) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.2 at the group level.
+
+NOTE: **Note:**
+As of GitLab 12.3 this feature is enabled by the `cycle_analytics` feature flag.
 Cycle Analytics measures the time spent to go from an [idea to production] - also known
 as cycle time - for each of your projects. Cycle Analytics displays the median time for an idea to
@@ -24,9 +27,6 @@ Cycle Analytics is available:
   In the future, multiple groups will be selectable which will effectively make this an
   instance-level feature.
-  NOTE: **Note:**
-  Requires the [analytics workspace](index.md) to be enabled.
-
 - At the project level via **Project > Cycle Analytics**.
 There are seven stages that are tracked as part of the Cycle Analytics calculations.

doc/user/analytics/index.md

 # Analytics workspace
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/12077) in GitLab 12.2 (enabled using `analytics` feature flag).
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/12077) in GitLab 12.2.
 The Analytics workspace will make it possible to aggregate analytics across
 GitLab, so that users can view information across multiple projects and groups
 in one place.
-To access the centralized analytics workspace:
-
-1. Ensure it's enabled. Requires a GitLab administrator to enable it with the `analytics` feature
-   flag.
-1. Once enabled, click on **Analytics** from the top navigation bar.
+To access the centralized analytics workspace, click on **Analytics** from the top navigation bar.
 ## Available analytics
 From the centralized analytics workspace, the following analytics are available:
-- [Cycle Analytics](cycle_analytics.md).
+- [Cycle Analytics](cycle_analytics.md):
+
+1. Requires a GitLab administrator to enable it with the `cycle_analytics` feature flag.
+1. Once enabled, click on **Analytics** and then **Cycle Analytics** from the top navigation bar.
 NOTE: **Note:**
 Project-level Cycle Analytics are still available at a project's **Project > Cycle Analytics**.