I find `Symfony stores the session data...` unclear - only because I don't know what "Symfony" is - it could be the full stack, could be SE, and in many cases, users don't really know the difference. Chances are, if someone starts using Symfony today, they will use the SE and then the effective default is for the `php.ini` values to be used. So even though what you had before is correct, an average user will see this as a bug in the documentation.

What do you think?