Fix minor roadmap nits

[luisquintanilla]

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This change fixes LightGBM spelling issues and list formatting.

[codecov]

Codecov Report

Merging #6480 (104fe60) into main (42788c4) will decrease coverage by 0.00%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6480      +/-   ##
==========================================
- Coverage   68.57%   68.57%   -0.01%     
==========================================
  Files        1171     1171              
  Lines      247197   247197              
  Branches    25799    25799              
==========================================
- Hits       169515   169513       -2     
- Misses      70959    70960       +1     
- Partials     6723     6724       +1     

Flag	Coverage Δ
Debug	68.57% <ø> (-0.01%)	⬇️
production	62.96% <ø> (-0.01%)	⬇️
test	88.98% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...soft.ML.Data/DataLoadSave/Text/TextLoaderCursor.cs	89.45% <0.00%> (-0.80%)	⬇️
src/Microsoft.ML.LightGbm/LightGbmTrainerBase.cs	79.77% <0.00%> (+0.27%)	⬆️
src/Microsoft.ML.Maml/MAML.cs	25.88% <0.00%> (+0.50%)	⬆️