PER-CS Code Highlighting Errors

[ravage84]

Going through the specification, I've noticed some of the (PHP) code highlighting to be somewhat off.

3. Declare Statements, Namespace, and Import Statements:

4.2 Using traits

10. Heredoc and Nowdoc:

[Jean85]

This is done in https://github.com/php-fig/www.php-fig.org/ using spatie/commonmark-highlighter:

www.php-fig.org/composer.json

Line 9 in d4e8ce8

"spatie/commonmark-highlighter": "^2.1",

I'm moving this issue in that repo.

It's fairly new syntax, I don't know if that package supports that already (and we just have to upgrade it) or not...