Broken Link in smithy-http byte_stream

### What is the problem?

The link in line 136 of
https://github.com/awslabs/aws-sdk-rust/blob/main/sdk/aws-smithy-http/src/byte_stream.rs

[`impl Stream`](futures_core::Stream)

is broken, as it expands to https://docs.rs/aws-sdk-s3/0.4.0/aws_sdk_s3/futures_core::Stream

Instead, it should point to the `futures-rs` library.

### Version

main

### Platform

na

### AWS Services

_No response_

### Description

_No response_

### Logs

_No response_

Open sdk/aws-smithy-http/src/byte_stream.rs and inspect the link around line 136. Check how the futures-rs Stream documentation is referenced elsewhere in the repository, then verify the corrected link resolves to the intended futures-rs documentation. Done means the link no longer resolves through the aws-sdk-s3 page and points to futures_core::Stream correctly.

Written by the indexing model from the issue text.