Editing role (#6460)

## What are you changing in this pull request and why?

Since the dbt Cloud app is not in the official Slack marketplace only
Workspace Owners can install

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<!-- vercel-deployment-preview -->
---
🚀 Deployment available! Here are the direct links to the updated files:


-
https://docs-getdbt-com-git-slack-dbt-labs.vercel.app/docs/deploy/job-notifications

<!-- end-vercel-deployment-preview -->

website/docs/docs/deploy/job-notifications.md

@@ -56,7 +56,7 @@ If there has been a change in user roles or Slack permissions where you no longe
 :::
 
 ### Prerequisites 
-- You must be an administrator of the Slack workspace. 
+- You must be a Slack Workspace Owner. 
 - You must be an account admin to configure Slack notifications in dbt Cloud. For more details, refer to [Users and licenses](/docs/cloud/manage-access/seats-and-users).
 - The integration only supports _public_ channels in the Slack workspace.