Add a small illustration of bounds checking.

[gendx]

Not strictly necessary at this stage of the course, but this page didn't have much content and I found it interesting that the compiler even checks the bounds at compile time when the array length is already known :)

Let me know what you think!

[mgeisler]

Hey @gendx, I think I'm not a fan of adding more code right here — we will see the exact same thing in a few slides when we talk about arrays. Keeping the slide simple and focused is more important to me than showing all the things as early as possible.

[mgeisler]

I think we can close this — I would really like an actual diagram on the relevant page where we talk about arrays and stack/heap etc, but I think we should keep this slide focused.