Missing annotation routing config when not using flex

[linaori]

In (legacy) applications that have yet to migrate, or never will use flex, it's a bit cumbersome to get annotation routings to work. On https://symfony.com/doc/current/routing.html#creating-routes it's explained that you can do composer require annotations, but this only works when you have flex.

When searching for symfony annotation routing, you either get flex tutorials, the page I just linked, or the SensioFrameworkExtraBundle documentation for routing. This while basically the code example + explanation from the next link would be sufficient in combination with the required packages (doctrine annotations?): https://symfony.com/doc/current/best_practices/controllers.html#routing-configuration

[javiereguiluz]

@linaori thanks for reporting this issue. Symfony Docs assume that the reader is using Flex and we cannot change that because ti'd complicate the docs too much.

However, I think we can reword the routing docs a bit to explain things with a bit more detail. Not enough to complicate things ... but enough to shed some light into this. See #12336.