It's a reference sheet for a programming language. Like it's clearly designed to be read as you're writing code. I don't understand in which circumstance you'd optimize such a document for mobile use.
I opened it on mobile because I was interested in seeing how they differ, even though I’m not using either right now.
Not everything needs to cater to mobile.
Nothing has to cater to anything but I'm still allowed to be annoyed that I can't read it on mobile.
It happens what when I cannot stop thinking of a problem and really want to find a solution.