fix: [Docs][TeamTools] Since StringExtensionToConfigBuilderRector is deprecated this section is no longer relevant

[Yoann-TYT]

Hi Everyone !

This PR removes a section of the documentation that referred to a rule now deprecated since this PR.
As the rule no longer works, it doesn’t make sense to keep it documented.

I’d also like to thank the Rector community for everything they bring to the PHP ecosystem — truly impressive work.
I found the arguments for moving from YAML to PHP configuration very compelling, and I'm sad that this approach is no longer supported.

[TomasVotruba]

Hey,

this is a different topic. The Rector rules is related to Symfony 5.3 feature by Tobias Nyholm: https://symfony.com/blog/new-in-symfony-5-3-config-builder-classes

The config-transformer handles YAML to PHP array-like configuration: https://tomasvotruba.com/blog/2020/07/27/how-to-switch-from-yaml-xml-configs-to-php-today-with-migrify

They both have "PHP" keywords, but it's a different feature. More confusion will come with news PHP-arrays config format :)

[Yoann-TYT]

Thanks for the clarification, @TomasVotruba ! that makes perfect sense.
You’re right, the original line mixed two different things.

I can open a new PR with a clearer version like this :

There is also symplify/config-transformer that helps with transforming YAML or XML Symfony configs into PHP array-based configuration files.

Note: The Rector rule StringExtensionToConfigBuilderRector, which converted YAML configs into Symfony Config Builder classes, has been deprecated, since the fluent PHP configuration format is no longer recommended in Symfony.

That should clarify the intent while keeping the useful reference to config-transformer.

[TomasVotruba]

No worries 👍

That would suggest they're related, which is not true.

Symfony docs should make more clear which is which. That's the root source of knowledge for Symfony devs.