Merge pull request #3964 from bruno-/fiber-scheduler-list

Link to fiber scheduler list

Author: rmosolgo

guides/dataloader/nonblocking.md

@@ -33,7 +33,7 @@ Fiber.set_scheduler(MySchedulerImplementation.new)
 MySchema.execute(...)
 ```
 
-The scheduler must implement [`Fiber::SchedulerImplementation`](https://ruby-doc.org/core-3.0.2/Fiber/SchedulerInterface.html). Some implementations are available off-the-shelf:
+The scheduler must implement [`Fiber::SchedulerImplementation`](https://ruby-doc.org/core-3.0.2/Fiber/SchedulerInterface.html). Existing implementations can be found at [Fiber Scheduler List](https://github.com/bruno-/fiber_scheduler_list).
 
 - [`dsh0416/evt`](https://github.com/dsh0416/evt) supports several backends in `Evt::Scheduler`.
 -  [`digital-fabric/libev_scheduler`](https://github.com/digital-fabric/libev_scheduler) contains `Libev::Scheduler`, built on [`libev`](http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod), an event loop written in C. ⚠️ This _works_, but it was failing oddly on GitHub actions, so CI is turned off for it.