Update OnnxTransformer Doc XML

[jwood803]

Update for #4707.

Updates the doc XML to use the latest dynamic API.

[codecov]

Codecov Report

Merging #5085 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5085      +/-   ##
==========================================
- Coverage   75.66%   75.65%   -0.02%     
==========================================
  Files         993      993              
  Lines      178157   178157              
  Branches    19125    19125              
==========================================
- Hits       134800   134782      -18     
- Misses      38136    38146      +10     
- Partials     5221     5229       +8     

Flag	Coverage Δ
#Debug	75.65% <ø> (-0.02%)	⬇️
#production	71.62% <ø> (-0.02%)	⬇️
#test	88.67% <ø> (ø)

Impacted Files	Coverage Δ
...c/Microsoft.ML.FastTree/Utils/ThreadTaskManager.cs	79.48% <0.00%> (-20.52%)	⬇️
....ML.AutoML/PipelineSuggesters/PipelineSuggester.cs	80.67% <0.00%> (-6.73%)	⬇️
src/Microsoft.ML.AutoML/Sweepers/Parameters.cs	84.32% <0.00%> (-0.85%)	⬇️
...icrosoft.ML.AutoML/Experiment/SuggestedPipeline.cs	92.78% <0.00%> (ø)
...L.AutoML/TrainerExtensions/TrainerExtensionUtil.cs	86.89% <0.00%> (ø)

[harishsk]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[harishsk]

@jwood803 Thank you for your contribution.