Missing documentation of `renderAsGrid`

[koertho]

I found a new renderAsGrid option in DCA list -> sorting which changes the backend rendering. This should be documented.

[zoglo]

@koertho whilst you are it, mind documenting that one and mention that this one is used in combination with DataContainer::MODE_PARENT to render the child view with display: grid?

IIRC, this has been introduced in some early Contao 5 version which will also allow rendering elements with e. g. 50% width but I am not sure if that's all.

[fritzmg]

It was introduced in Contao 5.1.0: contao/contao#5609

[koertho]

I'm not in, just stumbled over it ;)
Currently I don't have the resources to document it, just wanted to leave a note that this is missing. I'm sorry, we have height water here .... :/