Contributing: Fix typo

[MaherJendoubi]

Fixed some spelling errors.

[codecov]

Codecov Report

Merging #4631 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4631      +/-   ##
==========================================
+ Coverage   75.62%   75.64%   +0.01%     
==========================================
  Files         938      938              
  Lines      168618   168618              
  Branches    18208    18208              
==========================================
+ Hits       127523   127554      +31     
+ Misses      36066    36037      -29     
+ Partials     5029     5027       -2

Flag	Coverage Δ
#Debug	75.64% <ø> (+0.01%)	⬆️
#production	71.27% <ø> (+0.02%)	⬆️
#test	90.43% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
src/Microsoft.ML.FastTree/FastTree.cs	80.66% <ø> (ø)	⬆️
...L.AutoML/TrainerExtensions/TrainerExtensionUtil.cs	85.15% <0%> (-1.75%)	⬇️
...soft.ML.Data/DataLoadSave/Text/TextLoaderCursor.cs	84.7% <0%> (-0.41%)	⬇️
src/Microsoft.ML.AutoML/Sweepers/Parameters.cs	85.16% <0%> (+0.84%)	⬆️
...soft.ML.Transforms/Text/WordEmbeddingsExtractor.cs	87.52% <0%> (+1.13%)	⬆️
src/Microsoft.ML.Maml/MAML.cs	26.21% <0%> (+1.45%)	⬆️
...rosoft.ML.AutoML/ColumnInference/TextFileSample.cs	62.25% <0%> (+2.64%)	⬆️
....ML.AutoML/PipelineSuggesters/PipelineSuggester.cs	86.55% <0%> (+3.36%)	⬆️
src/Microsoft.ML.Core/Data/ProgressReporter.cs	77.94% <0%> (+6.98%)	⬆️

[harishsk]

@MaherJendoubi Thank you for your contribution.