primitive_types3.rs: linked documentation no longer contains "fixed array with size" shorthand

[wittekm]

primitive_types3.rs mentions:

// There's a shorthand to initialize Arrays with a certain size that does not 
// require you to type in 100 items (but you certainly can if you want!)
// Check out the Primitive Types -> Arrays section of the book:
// https://doc.rust-lang.org/stable/book/second-edition/ch03-02-data-types.html#arrays

I suspect that the shorthand here is

    let a: [i32; 100] = [0; 100];

but that shorthand is no longer mentioned in the linked data types page.