Update example page

[qingyun-wu]

Why are these changes needed?

Improve documentation

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.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.62%. Comparing base (7ceee5d) to head (de9807b).
⚠️ Report is 2504 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1698   +/-   ##
=======================================
  Coverage   39.62%   39.62%           
=======================================
  Files          57       57           
  Lines        6006     6006           
  Branches     1338     1338           
=======================================
  Hits         2380     2380           
  Misses       3433     3433           
  Partials      193      193           

Flag	Coverage Δ
unittests	39.62% <ø> (ø)

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[AaronWard]

LGTM 👍