admin: access to insights (#21804)

## Description
- The support team requested that we add clarifying information to the
Insights guide that customers need to request access to Insights from
their CSM. Insights is not auto-enabled by default when a customer meets
the criteria (business subscription + require sign-in). Support receives
a lot of tickets where customers assume this is the case.

## Related issues or tickets
[ENGDOCS-2373](https://docker.atlassian.net/browse/ENGDOCS-2373)

## Reviews
- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

[ENGDOCS-2373]:
https://docker.atlassian.net/browse/ENGDOCS-2373?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

content/manuals/admin/organization/insights.md

@@ -28,6 +28,10 @@ Key benefits include:
 
 {{< include "admin-early-access.md" >}}
 
+To access Insights, you must contact your Customer Success Manager to have the
+feature enabled. Once the feature is enabled, access Insights using the following
+steps:
+
 1. Go to the [Admin Console](https://app.docker.com/admin/) and sign in to an
    account that is an organization owner.
 2. Select your company on the **Choose profile** page.