[Chapel Merge] Add a small note about the Qthreads requirement fo

Branch: refs/heads/main
Revision: 0638bbd
Author: e-kayrakli
Link: Unavailable
Log Message:

Merge pull request #20312 from e-kayrakli/gpu-qthreads-note

Add a small note about the Qthreads requirement for GPU support

fifo tasking layer doesn't support our GPU implementation today. This PR
adds a sentence for qthreads requirement to the GPU technote.

[Reviewed by @stonea]

Modified Files:
M doc/rst/technotes/gpu.rst

Compare: https://github.com/chapel-lang/chapel/compare/a1ff116e32dd...0638bbd11500