style: ruff format --block_size argparse call

Multi-line per ruff-format; line 296 exceeded 120 char limit (E501).

Signed-off-by: chenhany <chenhany@nvidia.com>

Author: ChenhanYu

examples/specdec_bench/run.py

@@ -293,7 +293,16 @@ def run_simple(args):
         "--output_length", type=int, required=False, default=4096, help="Output length"
     )
     parser.add_argument("--draft_length", type=int, required=False, default=3, help="Draft length")
-    parser.add_argument("--block_size", type=int, required=False, default=None, help="DFlash block size (num_speculative_tokens). Use instead of --draft_length for DFLASH: block_size = draft_length + 1.")
+    parser.add_argument(
+        "--block_size",
+        type=int,
+        required=False,
+        default=None,
+        help=(
+            "DFlash block size (num_speculative_tokens). Use instead of --draft_length "
+            "for DFLASH: block_size = draft_length + 1."
+        ),
+    )
     parser.add_argument(
         "--tp_size", type=int, required=False, default=4, help="Tensor parallel size"
     )