Minor updates to migration-guide.md

[victordibia]

Migration guide looks great and detailed!

This PR proposes a simple change ..

• remove unecessary todo links

Why are these changes needed?

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.21%. Comparing base (e168616) to head (b89bb06).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4888   +/-   ##
=======================================
  Coverage   68.21%   68.21%           
=======================================
  Files         158      158           
  Lines        9960     9960           
=======================================
  Hits         6794     6794           
  Misses       3166     3166           

Flag	Coverage Δ
unittests	68.21% <ø> (ø)

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[victordibia]

@jackgerrits .. any change this is a known issue?

[jackgerrits]

Yeah known issue - ignore for now

[jackgerrits]

Sorry - misclick on the close