Clarify documentation about Dev environment setup for Duo Chat
What does this MR do and why?
Improvements of our docs to make sure that it's clear for developers who are trying to setup their local environment to work with Duo Chat feature.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
NA
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
NA
Related to #438062 (closed)