Correct a link in threads1 hint

It didn't work without last character
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skaunov 2022-09-17 00:26:05 +03:00 committed by GitHub
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@ -969,7 +969,7 @@ https://doc.rust-lang.org/std/thread/fn.spawn.html
A challenge with multi-threaded applications is that the main thread can
finish before the spawned threads are completed.
https://doc.rust-lang.org/book/ch16-01-threads.html#waiting-for-all-threads-to-finish-using-join-handle
https://doc.rust-lang.org/book/ch16-01-threads.html#waiting-for-all-threads-to-finish-using-join-handles
Collect the JoinHandles and wait for them to finish.
https://doc.rust-lang.org/std/thread/struct.JoinHandle.html