Pull Request Title: Fix updates to agentchat files

Description

This pull request addresses fixes and updates to the following files:

• agentchat_memory_using_mem0.ipynb
• agentchat_RetrieveChat_qdrant.ipynb
• JSON_mode_example.ipynb

Changes include corrections to text and code formatting, ensuring consistency across the notebook files.

Related Issue

• Issue #[Issue Number] (if applicable)

Changes Made

agentchat_memory_using_mem0.ipynb

• Fixed typo: "numnber" changed to "number".
• Improved clarity by rewording comments.
• Corrected some variable names for better understanding.

agentchat_RetrieveChat_qdrant.ipynb

• Fixed typo: "functionalites" changed to "functionalities".
• Updated description of the agent's functionality for clarity.
• Corrected code formatting for better readability.

JSON_mode_example.ipynb

• Fixed typo: "anwser" changed to "answer".
• Improved consistency in formatting for JSON-related code blocks.

How to Test

1. Review the changes made in the respective notebooks.
2. Test each notebook to ensure the code executes without errors.
3. Verify that the logic aligns with the intended functionality described.

Checklist

• I have reviewed the code.
• I have tested the code.
• I have updated the documentation where necessary.
• I have added or verified tests if applicable.

Screenshots (if applicable)

• Attach any screenshots or examples to demonstrate the changes made.