The example in the concurrency guide is incorrect

The offending example is:

use std::thread::Thread;

fn main() {
    for _ in 0..10 {
        Thread::spawn(|| {
            println!("Hello World!");
        });
    }
}

With the new detaching thread semantics, this is incorrect since main can exit before all the detached threads have printed.

I think that this was in the intro as well.

Merge pull request rust-lang#20844 from A4-Tacks/add-braces-assignment

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