Improve Help Text when q-chat is launched

Current Help Text -
```
Hi, I'm Amazon Q. Ask me anything.

Things to try
• Fix the build failures in this project.
• List my s3 buckets in us-west-2.
• Write unit tests for my application.
• Help me understand my git status

/acceptall Toggles acceptance prompting for the session.
/profile (Beta) Manage profiles for the chat session
/context (Beta) Manage context files for a profile
/help Show the help dialogue
/quit Quit the application
```

Missing Information -
1. You can use `!` to run bash commands directly in q chat
2. You can start `q chat ` to provide an initial-input