Doc states function, should be test

I'm that guy. Please don't hate me. This is clearly not a big deal but I thought I'd submit an issue. I'm sure you're _really_ looking for a reason to address this.

https://github.com/pattern-lab/patternengine-php-twig/blob/f402a2f3e9aff0ead34fa9e8d0c3119d74e51997/src/PatternLab/PatternEngine/Twig/TwigUtil.php#L285

Should be:

```
/**
* Load tests for the Twig PatternEngine
*/
```