Backport change from aws-sdk-rust (#622)

* Backport change from https://github.com/awslabs/aws-sdk-rust/pull/162/files

* Update changelog

CHANGELOG.md

@@ -3,6 +3,7 @@
 - :bug: Correctly encode HTTP Checksums using base64 instead of hex. Fixes aws-sdk-rust#164. (#615)
 - (When complete) Add profile file provider for region (#594, #xyz)
 - Overhaul serialization/deserialization of numeric/boolean types. This resolves issues around serialization of NaN/Infinity and should also reduce the number of allocations required during serialization. (#618)
+- Update SQS example to clarify usage of FIFO vs. standard queues (#622, @trevorrobertsjr)
 
 ## v0.18.1 (July 27th 2021)
 * Remove timestreamwrite and timestreamquery from the generated services (#613)

aws/sdk/examples/sqs/src/bin/sqs-hello-world.rs

@@ -5,7 +5,7 @@
 
 use std::process::exit;
 
-/// Sends a message to and receives the message from a queue.
+/// Sends a message to and receives the message from a FIFO queue.
 #[tokio::main]
 async fn main() -> Result<(), sqs::Error> {
     tracing_subscriber::fmt::init();
@@ -29,6 +29,8 @@ async fn main() -> Result<(), sqs::Error> {
         .send_message()
         .queue_url(&queue_url)
         .message_body("hello from my queue")
+        // message group id required for FIFO Queue
+        // comment out ".message_group_id("MyGroup")" for standard queues
         .message_group_id("MyGroup")
         .send()
         .await?;