fix: typo in TestBase

[ppruthi]

Summary

Fixes spelling typo in a file.

Tests

N/A

Dependency changes

N/A

AB#1779545

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

Merging #1501 (7309848) into master (f940017) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1501      +/-   ##
==========================================
- Coverage   84.21%   84.17%   -0.04%     
==========================================
  Files         296      289       -7     
  Lines       14923    14788     -135     
  Branches      708      708              
==========================================
- Hits        12567    12448     -119     
+ Misses       2356     2340      -16     

Impacted Files	Coverage Δ
...org/apache/spark/ml/param/JsonEncodableParam.scala	57.89% <0.00%> (-26.32%)	⬇️
...g/apache/spark/ml/param/PythonWrappableParam.scala	66.66% <0.00%> (-8.34%)	⬇️
...re/src/main/python/synapse/ml/core/schema/Utils.py	67.10% <0.00%> (-5.27%)	⬇️
...soft/azure/synapse/ml/cognitive/TextToSpeech.scala	84.84% <0.00%> (-3.04%)	⬇️
...oft/azure/synapse/ml/cognitive/TextAnalytics.scala	86.59% <0.00%> (-2.69%)	⬇️
.../azure/synapse/ml/cognitive/TextAnalyticsSDK.scala	86.01% <0.00%> (-1.40%)	⬇️
...ft/azure/synapse/ml/cognitive/FormRecognizer.scala	75.00% <0.00%> (-0.93%)	⬇️
...t/azure/synapse/ml/cognitive/BingImageSearch.scala	89.28% <0.00%> (-0.90%)	⬇️
...crosoft/azure/synapse/ml/io/http/HTTPClients.scala	75.00% <0.00%> (ø)
...main/python/synapse/ml/io/http/ServingFunctions.py
... and 7 more

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