Update product analytics docs with changelog for permissions
What does this MR do and why?
Adds an item to the docs specifying when permissions for product analytics onboarding were updated.
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Screenshots or screen recordings
docs only change
How to set up and validate locally
View updated docs:
http://gdk.test:3005/ee/user/product_analytics#onboard-a-gitlab-project
Related to #465414 (closed)
Edited by Elwyn Benson