[Bug]: Hyperlinks in `readme.md` file doesn't work

[sahanHe]

Description

Hyper links located in https://github.com/ballerina-platform/ballerina-lang/tree/master/compiler/ballerina-treegen doesn't lead to any place as it gives 404 errors.

Steps to Reproduce

No response

Affected Version(s)

No response

OS, DB, other environment details and versions

No response

Related area

-> API Docs

Related issue(s) (optional)

No response

Suggested label(s) (optional)

No response

Suggested assignee(s) (optional)

No response