Update PR link in blog post (#3602)

* Update PR link in blog post

* Update index.mdx

website/blog/2024-10-02-new-autogen-architecture-preview/index.mdx

@@ -71,7 +71,7 @@ Today, we are delighted to share our progress and invite everyone to collaborate
 with us and provide feedback to evolve AutoGen and help shape the future of
 multi-agent systems.
 
-As the first step, we are opening a [pull request](#) into the main branch with the
+As the first step, we are opening a [pull request](https://github.com/microsoft/autogen/pull/3600) into the main branch with the
 current state of development of 0.4. After approximately a week, we plan to
 merge this into main and continue development. There's still a lot left to do
 before 0.4 is ready for release though, so keep in mind this is a work in
@@ -82,12 +82,12 @@ Starting in AutoGen 0.4, the project will have three main libraries:
 - **Core** - the building blocks for an event-driven agentic system.
 - **AgentChat** - a task-driven, high-level API built with core, including group
   chat, code execution, pre-built agents, and more. This is the most similar API
-  to AutoGen 0.2 and will be the easiest API to migrate to.
+  to AutoGen [0.2](https://github.com/microsoft/autogen/tree/0.2) and will be the easiest API to migrate to.
 - **Extensions** - implementations of core interfaces and third-party integrations
   (e.g., Azure code executor and OpenAI model client).
 
-AutoGen 0.2 is still available, developed and maintained out of the [0.2 branch](https://github.com/microsoft/autogen/tree/0.2).
-For everyone looking for a stable version, we recommend continuing to use 0.2
+AutoGen [0.2](https://github.com/microsoft/autogen/tree/0.2) is still available, developed and maintained out of the [0.2 branch](https://github.com/microsoft/autogen/tree/0.2).
+For everyone looking for a stable version, we recommend continuing to use [0.2](https://github.com/microsoft/autogen/tree/0.2)
 for the time being. It can be installed using:
 
 ```sh