At configuration-and-templating.html the step Creating never mentioned the console and what to do next. Thinking that with the command I set the configuration exactly as the tutorial, I didn't pay much attention and for my surprise I had a php file instead of yml. And for the Cleaning up section I couldn't find information where to save the twig file.
For my surprise, I had erased a few files, I file with no evident location to be saved, a different configuration.
After erasing the framework (bad idea) trying desesperate to restore my framework, I had a corrupt Symfony I don't know how to get back! The thing is that, while I am writing this, I founded that, something I thought was something like "more information if you're interested", there was the location where I had to save the twig!
Don't assume a user will understand everything, we cannot read your mind. Describe more what a user will find by clicking a link, if you want to skip the details where user should save the file (or something else), like you did at the begining by saying that the documentation at the official site was enough to us to understand how to set the enviroment.