Update StateFlow blog

[yiranwu0]

Why are these changes needed?

Update the StateFlow blog to reflect the changes to the paper.

Minor: minor correction to autodefense blog.

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 37.94%. Comparing base (6c3d779) to head (9156626).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2262   +/-   ##
=======================================
  Coverage   37.94%   37.94%           
=======================================
  Files          77       77           
  Lines        7784     7784           
  Branches     1667     1667           
=======================================
  Hits         2954     2954           
  Misses       4580     4580           
  Partials      250      250           

Flag	Coverage Δ
unittests	37.93% <ø> (ø)

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