Reverting some accidentally ressurected CHANGELOG entries (#3768)

## Motivation and Context
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## Description
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## Testing
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## Checklist
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- [ ] I have updated `CHANGELOG.next.toml` if I made changes to the
smithy-rs codegen or runtime crates
- [ ] I have updated `CHANGELOG.next.toml` if I made changes to the AWS
SDK, generated SDK code, or SDK runtime crates

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CHANGELOG.next.toml

@@ -11,30 +11,6 @@
 # meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client | server | all"}
 # author = "rcoh"
 
-[[smithy-rs]]
-message = "Support `stringArray` type in endpoints params"
-references = ["smithy-rs#3742"]
-meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client"}
-author = "landonxjames"
-
-[[smithy-rs]]
-message = "Add support for `operationContextParams` Endpoints trait"
-references = ["smithy-rs#3755"]
-meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client"}
-author = "landonxjames"
-
-[[aws-sdk-rust]]
-message = "`aws_smithy_runtime_api::client::orchestrator::HttpRequest` and `aws_smithy_runtime_api::client::orchestrator::HttpResponse` are now re-exported in AWS SDK clients so that using these types does not require directly depending on `aws-smithy-runtime-api`."
-references = ["smithy-rs#3591"]
-meta = { "breaking" = false, "tada" = false, "bug" = false }
-author = "ysaito1001"
-
-[[smithy-rs]]
-message = "`aws_smithy_runtime_api::client::orchestrator::HttpRequest` and `aws_smithy_runtime_api::client::orchestrator::HttpResponse` are now re-exported in generated clients so that using these types does not require directly depending on `aws-smithy-runtime-api`."
-references = ["smithy-rs#3591"]
-meta = { "breaking" = false, "tada" = false, "bug" = false, "target" = "client" }
-author = "ysaito1001"
-
 [[aws-sdk-rust]]
 message = "Fix incorrect redaction of `@sensitive` types in maps and lists."
 references = ["smithy-rs#3765",  "smithy-rs#3757"]