fix: Fix AsyncInferenceConfig documentation typo (aws#3471)

Author: claytonparnell

doc/overview.rst

@@ -1171,7 +1171,7 @@ be ``s3://sagemaker-{REGION}-{ACCOUNTID}/async-endpoint-outputs/{UNIQUE-JOB-NAME
     from sagemaker.async_inference import AsyncInferenceConfig
 
     # Create an empty AsyncInferenceConfig object to use default values
-    async_config = new AsyncInferenceConfig()
+    async_config = AsyncInferenceConfig()
 
 Or you can specify configurations in ``AsyncInferenceConfig`` as you like. All of those configuration parameters
 are optional but if you don’t specify the ``output_path``, Amazon SageMaker will use the default ``S3OutputPath``
@@ -1180,7 +1180,7 @@ mentioned above (example shown below):
 .. code:: python
 
     # Specify S3OutputPath, MaxConcurrentInvocationsPerInstance and NotificationConfig in the async config object
-    async_config = new AsyncInferenceConfig(
+    async_config = AsyncInferenceConfig(
         output_path="s3://{s3_bucket}/{bucket_prefix}/output",
         max_concurrent_invocations_per_instance=10,
         notification_config = {