fix: documentation spacing in compilation config help text

Author: Zerohertz

vllm/engine/arg_utils.py

@@ -874,7 +874,7 @@ def add_cli_args(parser: FlexibleArgumentParser) -> FlexibleArgumentParser:
                             '-O',
                             type=CompilationConfig.from_cli,
                             default=None,
-                            help='torch.compile configuration for the model.'
+                            help='torch.compile configuration for the model. '
                             'When it is a number (0, 1, 2, 3), it will be '
                             'interpreted as the optimization level.\n'
                             'NOTE: level 0 is the default level without '