Render target limitations need to be documented

Hi *,

that render targets which sides are not a power of two or which are
larger than the current regular output window itself can break things.

Right now, the wiki doesn’t mention such things at all:

Unless using render targets is possible at any excessive size with no
different size limits than those of SDL_Textures itself (so
essentially the max texture size of the driver and the gpu memory
dimensions), this really should be updated to reflect the limitations.

I would put in the info myself if I had more knowledge on render
targets, but I’d rather leave it to someone who knows all the details.

Jonas Thiem>From my previous experience with render targets (not much) I recall