Correct small typos in system messages

[pbadeer]

Why are these changes needed?

Just correcting misspelling of the word "coordinator" in a number of default system messages.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[pbadeer]

@microsoft-github-policy-service agree

[BeibinLi]

LGTM

[victordibia]

These look good to me. Thanks.

@pbadeer , thanks for the updates.
In the future, for autogenstudio updates, it would be great to follow the autogenstudio contribution guide

The main change is that autogenstudio is being heavily developed on the autogenstudio branch. It would be helpful to merge into that branch to ensure consistency.

@jackgerrits @BeibinLi

[pbadeer]

Will use that branch next time, sorry for the mistake.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fd0094c) 32.48% compared to head (c497fba) 32.48%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1410   +/-   ##
=======================================
  Coverage   32.48%   32.48%           
=======================================
  Files          41       41           
  Lines        4907     4907           
  Branches     1120     1120           
=======================================
  Hits         1594     1594           
  Misses       3187     3187           
  Partials      126      126           

Flag	Coverage Δ
unittests	32.44% <ø> (ø)

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[sonichi]

Could you fix the code format error? You can use pre-commit to help.