The link https://github.com/Azure/autorest/blob/main/docs/developer/architecture/AutoRest-extension.md is missing

[dolauli]

The link mentioned in https://github.com/Azure/autorest/blob/main/packages/extensions/modelerfour/readme.md is broken. And the link also appears in https://github.com/Azure/autorest.powershell/blob/main/readme.md.

Before asking the question:

• [ ] have you checked the faq, the documentation in the docs folder and couldn't find the information there
• [ ] have you checked existing issues for a similar question?