Make sure one can run XML config examples

[Nyholm]

XML is currently disabled. I got errors on every code block when testing. It is probably me missing something, because I don't think every XML code block is wrong.

[Nyholm]

I dont know much about XML config.. but I cannot get it to work at all.

symfony-tools/symfony-application#3

[HeahDude]

Maybe symfony/symfony#46594 can partially fix this?

[HeahDude]

symfony/symfony#46594 has been merged.
Friendly ping @Nyholm :), anything else needed here to fix the XML config?

[Nyholm]

Thank you.

What happens if you enable the xml and run the test on all existing docs locally?

[OskarStark]

What about tagging a new major (aka 0.3.0) of the tool and create a PR on symfony/docs with the new release?

[HeahDude]

What happens if you enable the xml and run the test on all existing docs locally?

In any case I may try this tonight, thanks.

[HeahDude]

It seems that the tools cannot run on 4.4 is that expected?

[HeahDude]

I think we need a branch of this tool dedicated for each major version of Symfony.

[HeahDude]

So I've tried, see #44.