Tiny doc improvement: prefer let mut item: ActiveModel = Default::default();

[greyblake]

Hi, thanks for the work you do!

I was reading through the docs, and noticed that one thing can be slightly shorten.
Instead of

    let mut item = ActiveModel {
        ..Default::default()
    };

One could write

let mut item: ActiveModel = Default::default();

The PR also fixes indentation in the add function (4 spaces instead of 2 spaces).

[greyblake]

The scaffold with --api option also uses patch for update.

[jondot]

Thanks, the reason we use the "spread" variant is that often you want to actually plug a few values right there, and so it is more convenient that we use this.
However I cannot create a convincing argument enough :)