unnecceserry join

[mohamadk]

kotlinx.coroutines/kotlinx-coroutines-core/jvm/test/guide/example-supervision-01.kt

Line 20 in b5679ab

firstChild.join()

I think this is unnecessary join since the timeout for the second job is int.max
also, it doesn't make sense in the context of this example to join the first job to the second because the sample tries to explain how two different cancellations can be totally independent

[mohamadk]

also why this sample is not executable in the doc?

[qwwdfsad]

This join is rather to explicitly show that the second coroutine executes after the first one has failed.
It's not really necessary indeed.

The sample is not executable because it was an oversight :)