docs(pipelines): fix link for originarl API document in README (#30852)

Fixed a broken link.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https:/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https:/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk-lib/pipelines/README.md

@@ -28,7 +28,7 @@ construct library directly.
 > engines other than CodePipeline.
 >
 > The README for the original API, as well as a migration guide, can be found in
-> [our GitHub repository](https:/aws/aws-cdk/blob/main/packages/@aws-cdk/pipelines/ORIGINAL_API.md).
+> [our GitHub repository](https:/aws/aws-cdk/blob/main/packages/aws-cdk-lib/pipelines/ORIGINAL_API.md).
 
 ## At a glance