Update sky/backends/cloud_vm_ray_backend.py

Co-authored-by: Zongheng Yang <[email protected]>

sky/backends/cloud_vm_ray_backend.py

@@ -271,8 +271,8 @@ def get_or_fail(futures, pg) -> List[int]:
                 ready = []
                 # Keep invoking ray.wait if ready is empty. This is because
                 # ray.wait with timeout=None will only wait for 10**6 seconds,
-                # which will cause the task longer than 12 days returned before
-                # it is ready.
+                # which will cause tasks running for more than 12 days to return before
+                # becoming ready. (Such tasks are common in serving jobs.)
                 # Reference: https://github.com/ray-project/ray/blob/ray-2.9.3/python/ray/_private/worker.py#L2845-L2846
                 while not ready:
                     ready, unready = ray.wait(futures)