[Docs Agent] Update Docs Agent's README.md file, which was missed its 0.4.1 update.

[kyolee415]

Description of the change

Updated Docs Agent's main README.md file to bring the changes missed in its 0.4.1 update.

Motivation

The previous 0.4.1 release didn't end up including the changes in Docs Agent's README.md.

Type of change

Choose one: (Documentation)

Checklist

• [ X] I have performed a self-review of my code.
• [ X] I have added detailed comments to my code where applicable.
• [ X] I have verified that my change does not break existing code.
• [ X] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [ X] I am familiar with the Google Style Guide for the language I have coded in.
• [ X] I have read through the Contributing Guide and signed the Contributor License Agreement.