In that case we should probably refactor the entire source code and trim all lines to ~80 characters. That's how many I can see when looking at the Symfony docs.
Also, this horizontal scrolling applies to pretty much every doc page.

@alcaeus well, it's one of our standards in the docs to try to avoid crossing the 80th character in code blocks. But I never did a PR to fix all examples.

However, are you sure the null check wasn't worth it? We can also split the condition on multiple lines.

Alright, I'll split it tomorrow.
The removed null check is per a suggestion in the Symfony PR, I merely updated the docs to reflect that change.

@wouterj being different than null is already catched by the instanceof check

WouterJ: I've checked - 80 characters really doesn't make any sense here, since even with splitting there are quite a few lines that break an 80 character gutter. Let me know if I should still go ahead and split as much as possible or if we'll just leave it like that for now.
I've also squashed my two commits in a single one for better readibility.

well, let's do it this way in this PR. I'll fix it in another PR sometime...

Replaced by PR #2835