feat(sources): update documentation

[aws-cdk-automation]

⚠️ This Pull Request updates daily and will overwrite all manual changes pushed to the branch

Updates the documentation source from upstream. See details in workflow run.

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Automatically created by projen via the "update-source-documentation" workflow

[github-actions]

To work on this Pull Request, please create a new branch and PR. This prevents your work from being deleted by the automation.

Run the following commands inside the repo:

gh co 883
git switch -c fix-pr-883 && git push -u origin HEAD
gh pr create -t "fix: PR #883" --body "Fixes https://github.com/cdklabs/awscdk-service-spec/pull/883"

[github-actions]

@aws-cdk/aws-service-spec: Model database diff detected

├[~] service aws-codepipeline
│ └ resources
│    └[~] resource AWS::CodePipeline::Pipeline
│      └  - documentation: The `AWS::CodePipeline::Pipeline` resource creates a CodePipeline pipeline that describes how software changes go through a release process. For more information, see [What Is CodePipeline?](https://docs.aws.amazon.com/codepipeline/latest/userguide/welcome.html) in the *CodePipeline User Guide* .
│         + documentation: The `AWS::CodePipeline::Pipeline` resource creates a CodePipeline pipeline that describes how software changes go through a release process. For more information, see [What Is CodePipeline?](https://docs.aws.amazon.com/codepipeline/latest/userguide/welcome.html) in the *CodePipeline User Guide* .
│         For an example in YAML and JSON that contains the parameters in this reference, see [Examples](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-codepipeline-pipeline.html#aws-resource-codepipeline-pipeline--examples) .
├[~] service aws-elasticache
│ └ resources
│    └[~] resource AWS::ElastiCache::CacheCluster
│      └ properties
│         └ PreferredMaintenanceWindow: (documentation changed)
├[~] service aws-lightsail
│ └ resources
│    └[~] resource AWS::Lightsail::Container
│      ├ properties
│      │  └ PrivateRegistryAccess: (documentation changed)
│      └ types
│         └[~] type PrivateRegistryAccess
│           └  - documentation: Describes the configuration for an Amazon Lightsail container service to access private container image repositories, such as Amazon Elastic Container Registry ( Amazon ECR ) private repositories.
│              For more information, see [Configuring access to an Amazon ECR private repository for an Amazon Lightsail container service](https://docs.aws.amazon.com/latest/userguide/amazon-lightsail-container-service-ecr-private-repo-access) in the *Amazon Lightsail Developer Guide* .
│              + documentation: Describes the configuration for an Amazon Lightsail container service to access private container image repositories, such as Amazon Elastic Container Registry ( Amazon ECR ) private repositories.
│              For more information, see [Configuring access to an Amazon ECR private repository for an Amazon Lightsail container service](https://docs.aws.amazon.com/lightsail/latest/userguide/amazon-lightsail-container-service-ecr-private-repo-access) in the *Amazon Lightsail Developer Guide* .
└[~] service aws-rds
  └ resources
     └[~] resource AWS::RDS::DBInstance
       └ properties
          └ CACertificateIdentifier: (documentation changed)