Rollup merge of #27924 - pornel:bookthreadjoin, r=steveklabnik

The chapter on concurrency has two examples that both start with:

     let something = thread::spawn(…

but the returned values have different types, because the second example has `.join()` at the end of the expression.

I haven't noticed that join at first, and was wondering how is that possible that the result can have `.is_err()` and `.join()` methods.

I've changed the second example to have the same structure as the first, so they're easy to compare.

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