[doc] Updated streaming response limit to 200 MB (#548)

### Motivation:
AWS Lambda response streaming now supports a default maximum response
payload size of 200 MB (increased from 20 MB). This update aligns the
documentation with the new AWS limits.

### Modifications:
- Updated readme.md: Changed "soft limit of 20 MB" to "default maximum
response payload size of 200 MB"
- Updated Examples/Streaming/README.md: Same change as above
- Updated terminology to match AWS official documentation

### Result:
Documentation now accurately reflects the current AWS Lambda streaming
response limits, enabling users to understand they can stream up to 200
MB payloads.

Reference:
https://aws.amazon.com/about-aws/whats-new/2025/07/aws-lambda-response-streaming-200-mb-payloads/

Examples/Streaming/README.md

@@ -1,6 +1,6 @@
 # Streaming Lambda function
 
-You can configure your Lambda function to stream response payloads back to clients. Response streaming can benefit latency sensitive applications by improving time to first byte (TTFB) performance. This is because you can send partial responses back to the client as they become available. Additionally, you can use response streaming to build functions that return larger payloads. Response stream payloads have a soft limit of 20 MB as compared to the 6 MB limit for buffered responses. Streaming a response also means that your function doesn’t need to fit the entire response in memory. For very large responses, this can reduce the amount of memory you need to configure for your function.
+You can configure your Lambda function to stream response payloads back to clients. Response streaming can benefit latency sensitive applications by improving time to first byte (TTFB) performance. This is because you can send partial responses back to the client as they become available. Additionally, you can use response streaming to build functions that return larger payloads. Response stream payloads have a soft limit of 200 MB as compared to the 6 MB limit for buffered responses. Streaming a response also means that your function doesn’t need to fit the entire response in memory. For very large responses, this can reduce the amount of memory you need to configure for your function.
 
 Streaming responses incurs a cost. For more information, see [AWS Lambda Pricing](https://aws.amazon.com/lambda/pricing/).
 

readme.md

@@ -219,7 +219,7 @@ You can learn how to deploy and invoke this function in [the Hello JSON example
 
 ### Lambda Streaming Response
 
-You can configure your Lambda function to stream response payloads back to clients. Response streaming can benefit latency sensitive applications by improving time to first byte (TTFB) performance. This is because you can send partial responses back to the client as they become available. Additionally, you can use response streaming to build functions that return larger payloads. Response stream payloads have a soft limit of 20 MB as compared to the 6 MB limit for buffered responses. Streaming a response also means that your function doesn’t need to fit the entire response in memory. For very large responses, this can reduce the amount of memory you need to configure for your function.
+You can configure your Lambda function to stream response payloads back to clients. Response streaming can benefit latency sensitive applications by improving time to first byte (TTFB) performance. This is because you can send partial responses back to the client as they become available. Additionally, you can use response streaming to build functions that return larger payloads. Response stream payloads have a soft limit of 200 MB as compared to the 6 MB limit for buffered responses. Streaming a response also means that your function doesn’t need to fit the entire response in memory. For very large responses, this can reduce the amount of memory you need to configure for your function.
 
 Streaming responses incurs a cost. For more information, see [AWS Lambda Pricing](https://aws.amazon.com/lambda/pricing/).