Update CONTRIBUTING.md

Author: rcoh

CONTRIBUTING.md

@@ -10,7 +10,7 @@ information to effectively respond to your request.
 
 1) This repository ([awslabs/aws-sdk-rust](https://github.com/awslabs/aws-sdk-rust)) 
 
-    This repository contains code generated from [awslabs/smithy-rs](https://github.com/awslabs/smithy-rs). If you want to contribute to the SDK by submitting feedback to our roadmap or filing a bug report, you can do so using this GitHub repository. However, because this repository is code generated from Smithy models using code gen machinery, **please do not submit PRs modifying code to this repository.**
+    This repository contains code generated from [awslabs/smithy-rs](https://github.com/awslabs/smithy-rs). If you want to contribute to the SDK by submitting feedback to our roadmap or filing a bug report, you can do so using this GitHub repository. However, because this repository is code generated from Smithy models, **please do not submit PRs modifying code to this repository.**
 
 2) Smithy-based SDK generation repo ([awslabs/smithy-rs](https://github.com/awslabs/smithy-rs))
 
@@ -30,7 +30,7 @@ reported the issue. Please try to include as much information as you can. Detail
 
 
 ## Contributing via Pull Requests
-Contributions via pull requests are much appreciated, however, because all of the code on this repository has been code generated from the [smithy-rs](https://github.com/awslabs/smithy-rs), **please do not submit code-changing PRs to this repo**. The below instructions are for PR that do not update code, such as documentation changes.
+Contributions via pull requests are much appreciated, however, because all of the code on this repository has been code generated from the [smithy-rs](https://github.com/awslabs/smithy-rs), **please do not submit PRs modifying the `sdk` folder to this repo**. The below instructions are for PR that do not update code, such as documentation changes.
 
 Before sending us a pull request, please ensure that: