Improve doc formatting of initiate_chats

[gagb]

Why are these changes needed?

This pull request includes a change to the initiate_chats method in the autogen/agentchat/chat.py file. The change simplifies the description of the chat_queue parameter, making it easier to understand in vscode.

Previously, the documentation was formatted in a manner that made it hard to read the documentation-- see before and after screenshots below. The change also made the language slightly concise.

Before:

After:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.41%. Comparing base (00972a6) to head (ee17f19).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2041       +/-   ##
===========================================
+ Coverage   36.90%   48.41%   +11.50%     
===========================================
  Files          66       66               
  Lines        7031     7031               
  Branches     1538     1666      +128     
===========================================
+ Hits         2595     3404      +809     
+ Misses       4210     3341      -869     
- Partials      226      286       +60     

Flag	Coverage Δ
unittests	48.28% <ø> (+11.37%)	⬆️

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[sonichi]

Thanks. There are many other format issues like this.