docs(codepipeline): fix module name in README "@aws-cdk/aws-codepipel…

…ine-actions" => "aws-cdk-lib/aws-codepipeline-actions" (#26057)

README for aws-cdk-lib.aws_codepipeline module includes old module name `@aws-cdk/aws-codepipeline-actions`. Currently `aws-cdk-lib/aws-codepipeline-actions` is correct.

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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/aws-codepipeline/README.md

@@ -115,7 +115,7 @@ this stage automatically. The transition can then be "manually" enabled later on
 
 ## Actions
 
-Actions live in a separate package, `@aws-cdk/aws-codepipeline-actions`.
+Actions live in a separate package, `aws-cdk-lib/aws-codepipeline-actions`.
 
 To add an Action to a Stage, you can provide it when creating the Stage,
 in the `actions` property,
@@ -130,7 +130,7 @@ sourceStage.addAction(someAction);
 
 ## Custom Action Registration
 
-To make your own custom CodePipeline Action requires registering the action provider. Look to the `JenkinsProvider` in `@aws-cdk/aws-codepipeline-actions` for an implementation example.
+To make your own custom CodePipeline Action requires registering the action provider. Look to the `JenkinsProvider` in `aws-cdk-lib/aws-codepipeline-actions` for an implementation example.
 
 ```ts
 // Make a custom CodePipeline Action
@@ -413,7 +413,7 @@ new OtherAction({
 });
 ```
 
-Check the documentation of the `@aws-cdk/aws-codepipeline-actions`
+Check the documentation of the `aws-cdk-lib/aws-codepipeline-actions`
 for details on how to use the variables for each action class.
 
 See the [CodePipeline documentation](https://docs.aws.amazon.com/codepipeline/latest/userguide/reference-variables.html)