Update free user cap docs for public and personal namespaces
What does this MR do and why?
updates the docs to reflect change in direction via https://gitlab.com/gitlab-org/gitlab/-/issues/370616
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #363493
Edited by Doug Stull