Update mentions to codegen configuration key in changelog

As well as in one error message.

The key is `codegen`, not `codegenConfig`.

CHANGELOG.md

@@ -16,7 +16,19 @@ December 12th, 2022
 
  Upon receiving a request that violates the modeled constraints, the server SDK will reject it with a message indicating why.
 
- Unsupported (constraint trait, target shape) combinations will now fail at code generation time, whereas previously they were just ignored. This is a breaking change to raise awareness in service owners of their server SDKs behaving differently than what was modeled. To continue generating a server SDK with unsupported constraint traits, set `codegenConfig.ignoreUnsupportedConstraints` to `true` in your `smithy-build.json`.
+ Unsupported (constraint trait, target shape) combinations will now fail at code generation time, whereas previously they were just ignored. This is a breaking change to raise awareness in service owners of their server SDKs behaving differently than what was modeled. To continue generating a server SDK with unsupported constraint traits, set `codegen.ignoreUnsupportedConstraints` to `true` in your `smithy-build.json`.
+
+ ```json
+ {
+ ...
+ "rust-server-codegen": {
+ ...
+ "codegen": {
+ "ignoreUnsupportedConstraints": true
+ }
+ }
+ }
+ ```
 - ⚠🎉 (server, [smithy-rs#1342](https://github.com/awslabs/smithy-rs/issues/1342), [smithy-rs#1119](https://github.com/awslabs/smithy-rs/issues/1119)) Server SDKs now generate "constrained types" for constrained shapes. Constrained types are [newtypes](https://rust-unofficial.github.io/patterns/patterns/behavioural/newtype.html) that encapsulate the modeled constraints. They constitute a [widespread pattern to guarantee domain invariants](https://www.lpalmieri.com/posts/2020-12-11-zero-to-production-6-domain-modelling/) and promote correctness in your business logic. So, for example, the model:
 
  ```smithy
@@ -35,7 +47,19 @@ December 12th, 2022
 
  Constrained types _guarantee_, by virtue of the type system, that your service's operation outputs adhere to the modeled constraints. To learn more about the motivation for constrained types and how they work, see [the RFC](https://github.com/awslabs/smithy-rs/pull/1199).
 
- If you'd like to opt-out of generating constrained types, you can set `codegenConfig.publicConstrainedTypes` to `false`. Note that if you do, the generated server SDK will still honor your operation input's modeled constraints upon receiving a request, but will not help you in writing business logic code that adheres to the constraints, and _will not prevent you from returning responses containing operation outputs that violate said constraints_.
+ If you'd like to opt-out of generating constrained types, you can set `codegen.publicConstrainedTypes` to `false`. Note that if you do, the generated server SDK will still honor your operation input's modeled constraints upon receiving a request, but will not help you in writing business logic code that adheres to the constraints, and _will not prevent you from returning responses containing operation outputs that violate said constraints_.
+
+ ```json
+ {
+ ...
+ "rust-server-codegen": {
+ ...
+ "codegen": {
+ "publicConstrainedTypes": false
+ }
+ }
+ }
+ ```
 - 🐛⚠🎉 (server, [smithy-rs#1714](https://github.com/awslabs/smithy-rs/issues/1714), [smithy-rs#1342](https://github.com/awslabs/smithy-rs/issues/1342)) Structure builders in server SDKs have undergone significant changes.
 
  The API surface has been reduced. It is now simpler and closely follows what you would get when using the [`derive_builder`](https://docs.rs/derive_builder/latest/derive_builder/) crate:

codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/ValidateUnsupportedConstraints.kt

@@ -48,7 +48,7 @@ private sealed class UnsupportedConstraintMessageKind {
  if (canBeIgnored) {
  msg += """
  If you want to go ahead and generate the server SDK ignoring unsupported constraint traits, set the key `ignoreUnsupportedConstraints`
- inside the `runtimeConfig.codegenConfig` JSON object in your `smithy-build.json` to `true`."""
+ inside the `runtimeConfig.codegen` JSON object in your `smithy-build.json` to `true`."""
  }
  return msg.trimIndent().replace("\n", " ")
  }