docs: Slightly improve navigation-blocking.md to avoid confusion

[reihwald]

This is something really small. I'd expect for the reject of the example SaveBlocker:

<SaveBlocker
  confirm={() => {
    modals.closeAll()
    resolve(true)
  }}
  reject={() => {
    modals.closeAll()
    resolve(true)
  }}
/>

to block the navigation instead of letting in through, as it currently does.

I also think that having the inverted shouldLeave is needlessly confusing when not using window.confirm.

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commit: b7d40ba