Super tiny fix doc (#5233)

Author: fzyzcjy

python/sglang/srt/entrypoints/engine.py

@@ -348,8 +348,8 @@ def update_weights_from_tensor(
         load_format: Optional[str] = None,
         flush_cache: bool = True,
     ):
-        """Update weights from distributed source. If there are going to be more updates, set `flush_cache` to be true
-        to avoid duplicated operations such as clearing cache."""
+        """Update weights from distributed source. If there are going to be more updates, set `flush_cache` to be false
+        to avoid duplicated cache cleaning operation."""
         obj = UpdateWeightsFromTensorReqInput(
             serialized_named_tensors=[
                 MultiprocessingSerializer.serialize(named_tensors)