docs: GitHub source link on API Documentation

### Describe the feature

Individual Each library (s3, ec2, lambda, etc) has a link to where that libraries code is defined in the aws-cdk GitHub Repo

### Use Case

It make's it easier to troubleshoot/understand behavior of the construct and its properties. I often find myself manually searching the GitHub repo to do this and it can be tedious to do so.

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.144.0 (build 5fb15bc)

### Environment details (OS name and version, etc.)

mac os

The issue names no files, tests, or entry points. Start by locating how the AWS CDK API documentation is generated and where individual library pages are defined. Done means each library page, such as s3, ec2, and lambda, includes a link to the corresponding source in the aws-cdk GitHub repository.

Written by the indexing model from the issue text.