Update the example provided in the documentation for `Development Versus Production: Environments`

[ovidiuenache]

The example provided in the Development Versus Production: Environments section of the The Architecture documentation page is outdated since it is using the old way of splitting the configuration per environment:

The default Symfony project created via the binary (or alternatives) is using the new single-file approach with when@<environment>.

Can I proceed and create a PR that changes the example?

[OskarStark]

Yes please

[javiereguiluz]

Fixed in #18167.