Add documentation for finding instance Analytics

Previously the instance-level Analytics feature documentation pages
did not include guidance for how to locate the feature. This adds
instructions for navigating to the feature, for each of the 3
available.

doc/user/admin_area/analytics/dev_ops_report.md

@@ -10,6 +10,8 @@ The DevOps Report gives you an overview of your entire instance's adoption of
 [Concurrent DevOps](https://about.gitlab.com/topics/concurrent-devops/)
 from planning to monitoring.
 
+To see DevOps Report, go to **Admin Area > Analytics > DevOps Report**.
+
 ## DevOps Score
 
 DevOps Score displays the usage of GitLab's major features on your instance over

doc/user/admin_area/analytics/instance_statistics.md

@@ -4,6 +4,8 @@
 
 Instance Statistics gives you an overview of how much data your instance contains, and how quickly this volume is changing over time.
 
+To see Instance Statistics, go to **Admin Area > Analytics > Instance Statistics**.
+
 ## Total counts
 
 At the top of the page, Instance Statistics shows total counts for:

doc/user/admin_area/analytics/user_cohorts.md

@@ -5,6 +5,8 @@
 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.
 
+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