[Docs] Remove outdated async_scheduling limitation with speculative decoding (#32775)

Signed-off-by: Ifta Khairul Alam Adil <ikaadil007@gmail.com>
Signed-off-by: Ifta khairul Alam Adil <25082512+ikaadil@users.noreply.github.com>

vllm/config/scheduler.py

@@ -133,9 +133,6 @@ class SchedulerConfig:
     async_scheduling: bool = Field(default=None)
     """If set to False, disable async scheduling. Async scheduling helps to
     avoid gaps in GPU utilization, leading to better latency and throughput.
-    It is currently not supported with some features such as
-    speculative decoding and pipeline parallelism, and will be automatically
-    disabled in those cases.
     """
 
     stream_interval: int = Field(default=1, ge=1)