Merge branch 'docs-cohorts-style-update' into 'master'

Update Cohorts page to improve style

See merge request gitlab-org/gitlab!50668

doc/user/admin_area/analytics/user_cohorts.md

@@ -6,32 +6,31 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 
 # Cohorts **(CORE)**
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/23361) in GitLab 9.1.
-
 As a benefit of having the [usage ping active](../settings/usage_statistics.md),
-GitLab lets you analyze the users' activities over time of your GitLab installation.
+you can analyze your users' GitLab activities over time.
 
-To see User Cohorts, go to **Admin Area > Analytics > Cohorts**.
+To see user cohorts, go to **Admin Area > Analytics > Cohorts**.
 
 ## Overview
 
-How do we read the user cohorts table? Let's take an example with the following
-user cohorts.
+How do you interpret the user cohorts table? Let's review an example with the
+following user cohorts:
 
 ![User cohort example](img/cohorts_v13_4.png)
 
-For the cohort of March 2020, three users have been added on this server and have
-been active since this month. One month later, in April 2020, two users are
-still active. Five months later (August), we can see that one user from this cohort
-is active, or 33% of the original cohort of three that joined in March.
+For the cohort of March 2020, three users were added to this server and have
+been active since this month. One month later (April 2020), two users are still
+active. Five months later (August 2020), one user from this cohort is still
+active, or 33% of the original cohort of three that joined in March.
 
-The Inactive users column shows the number of users who have been added during
-the month, but who have never actually had any activity in the instance.
+The **Inactive users** column shows the number of users who were added during
+the month, but who never had any activity in the instance.
 
 How do we measure the activity of users? GitLab considers a user active if:
 
 - The user signs in.
 - The user has Git activity (whether push or pull).
-- The user visits pages related to Dashboards, Projects, Issues, and Merge Requests ([introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/54947) in GitLab 11.8).
-- The user uses the API
-- The user uses the GraphQL API
+- The user visits pages related to dashboards, projects, issues, or merge
+  requests ([introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/54947) in GitLab 11.8).
+- The user uses the API.
+- The user uses the GraphQL API.