remove lambda note from the API Gateway docs (#7201)

Author: lleadbet

docs/source/routing/operations/subscriptions/api-gateway.mdx

@@ -95,6 +95,4 @@ Streaming of HTTP multipart is supported out of the box with no additional confi
 
 ## AWS API Gateway
 
-AWS API Gateway doesn't support streaming of HTTP data.
-
-A possible workaround is to use a Lambda expression which does support streaming. To learn more, see [AWS Lambda response streaming](https://aws.amazon.com/blogs/compute/introducing-aws-lambda-response-streaming/).
+AWS API Gateway currently doesn't support streaming of HTTP data.