Truthy conversion: swtich from double negation to Boolean?

Looking at https://github.com/basarat/typescript-book/blob/120b111141abcffca11e63aa98639fb7d66073a6/docs/javascript/truthy.md?plain=1#L27 I see the book is using the `!!` for converting something to an explicit boolean value, which is always a bit hacky to read.

What about using the `Boolean` operator instead?

Open docs/javascript/truthy.md at the linked line and review the current example using double negation for explicit boolean conversion. Compare it with the proposed Boolean operator and update the example or explanation if appropriate, keeping the surrounding truthy-value guidance accurate.

Written by the indexing model from the issue text.