Update nuget known limitations

[pauld-msft]

Previous limitations was written before new nuget detector was rolled out. This clarifies some of the points and removes the indication that the new detector hasn't rolled out yet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.1%. Comparing base (4e42112) to head (fc2c031).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1295   +/-   ##
=====================================
  Coverage   89.1%   89.1%           
=====================================
  Files        361     361           
  Lines      27742   27742           
  Branches    1757    1757           
=====================================
  Hits       24721   24721           
  Misses      2643    2643           
  Partials     378     378           

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