Update teams.ipynb : In the sample code the termination condition is set to the text "APPROVE" but the documentation mentions "TERMINATE"

[abhijeethaval]

Why are these changes needed?

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• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.09%. Comparing base (abdc0da) to head (acd5695).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5426   +/-   ##
=======================================
  Coverage   78.09%   78.09%           
=======================================
  Files         158      158           
  Lines        9583     9583           
=======================================
  Hits         7484     7484           
  Misses       2099     2099           

Flag	Coverage Δ
unittests	78.09% <ø> (ø)

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