DSN template regression: shows __PUBLIC_DSN__

[bruno-garcia]

Steps to Reproduce

On both Unity and Unreal docs we have __PUBLIC_DSN__ which are not getting replaced by a demo URL or a user DSN if logged in.
In the case of Unity it has prefix/suffix ___, as it did Unreal, which I tried fixing by removing the extra _ but didn't help.

https://docs.sentry.io/platforms/unreal/#configure

https://docs.sentry.io/platforms/unity/#configure

Expected Result

A URL

Actual Result

a template

Additional Info

No response