fix links to Unit 2 notebook

Author: Jofthomas

units/en/unit2/langgraph/document_analysis_agent.mdx

@@ -16,7 +16,7 @@ For future such event, let's create a document analysis system using LangGraph t
 
 The workflow we'll build, follows a structured this schema:
 
-![Butler's Document Analysis Workflow](https://huggingface.co/datasets/agents-course/course-images/resolve/main/en/unit2/LangGraph/alfred_flow.png)
+![Butler's Document Analysis Workflow](https://huggingface.co/datasets/agents-course/course-images/main/en/unit2/LangGraph/alfred_flow.png)
 
 <Tip>
 You can follow the code in <a href="https://huggingface.co/agents-course/notebooks/blob/main/unit2/langgraph/agent.ipynb" target="_blank">this notebook</a> that you can run using Google Colab.

units/en/unit2/langgraph/first_graph.mdx

@@ -10,7 +10,7 @@ Now that we understand the building blocks, let's put them into practice by buil
 This example demonstrates how to structure a workflow with LangGraph that involves LLM-based decision-making. While this can't be considered an Agent as no tool is involved, this section focuses more on learning the LangGraph framework than Agents.
 
 <Tip>
-You can follow the code in <a href="https://huggingface.co/agents-course/notebooks/resolve/main/unit2/langgraph/mail_sorting.ipynb" target="_blank">this notebook</a> that you can run using Google Colab.
+You can follow the code in <a href="https://huggingface.co/agents-course/notebooks/blob/main/unit2/langgraph/mail_sorting.ipynb" target="_blank">this notebook</a> that you can run using Google Colab.
 </Tip>
 ## Our Workflow