Return impl AsyncBufRead from into_async_read

CHANGELOG.next.toml

@@ -17,6 +17,12 @@ references = ["smithy-rs#3126", "aws-sdk-rust#930"]
 meta = { "breaking" = false, "tada" = false, "bug" = true }
 author = "rcoh"
 
+[[aws-sdk-rust]]
+message = "Change `ByteStream::into_async_read` to return `AsyncBufRead`"
+references = ["smithy-rs#3164"]
+meta = { "breaking" = false, "tada" = false, "bug" = true }
+author = "utkarshgupta137"
+
 [[smithy-rs]]
 message = "The HTTP `Request`, `Response`, `Headers`, and `HeaderValue` types have been moved from `aws_smithy_runtime_api::client::http::*` into `aws_smithy_runtime_api::http`"
 references = ["smithy-rs#3138"]

rust-runtime/aws-smithy-types/src/byte_stream.rs

@@ -428,18 +428,17 @@ impl ByteStream {
     /// # Example
     ///
     /// ```rust
-    /// use tokio::io::{BufReader, AsyncBufReadExt};
     /// use aws_smithy_types::byte_stream::ByteStream;
     ///
     /// # async fn dox(my_bytestream: ByteStream) -> std::io::Result<()> {
-    /// let mut lines =  BufReader::new(my_bytestream.into_async_read()).lines();
+    /// let mut lines =  my_bytestream.into_async_read().lines();
     /// while let Some(line) = lines.next_line().await? {
     ///   // Do something line by line
     /// }
     /// # Ok(())
     /// # }
     /// ```
-    pub fn into_async_read(self) -> impl tokio::io::AsyncRead {
+    pub fn into_async_read(self) -> impl tokio::io::AsyncBufRead {
         // The `Stream` trait is currently unstable so we can only use it in private.
         // Here, we create a local struct just to enable the trait for `ByteStream` and pass it
         // to `StreamReader`.