Docs: Update Event Handler Streaming Response Docs

[svozza]

What were you searching in the docs?

We exposed support for response streaming in #4753. We need to update to update the docs to explain how this works.

Is this related to an existing documentation section?

https://docs.aws.amazon.com/powertools/typescript/2.28.1/features/event-handler/rest/#response-streaming

How can we improve?

Add instructions on how to use HTTP streaming with HTTP event handler

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[powertools-for-aws-oss-automation]

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