[Issue 20665] std.concurrency.spawn should document not working with delegates

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20665

--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@Biotronic created dlang/phobos pull request #7506 "Fix  issue 20665 -
std.concurrency.spawn should document not working with delegates" mentioning
this issue:

- Fix  issue 20665

https://github.com/dlang/phobos/pull/7506

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