[PR] Fix the variable name in the docs - testing_pyspark.ipynb [spark]

[via GitHub]

huciaa opened a new pull request, #43610:
URL: https://github.com/apache/spark/pull/43610

   ### What changes were proposed in this pull request?
   
   I'm changing a variable name in one of the cells in the documentation 
regarding pyspark testing.
   
   
   ### Why are the changes needed?
   
   Currently the code won't run. This simple fix will make the code in the 
documenatatnion usable.
   
   
   ### Does this PR introduce _any_ user-facing change?
   
   No
   
   
   ### How was this patch tested?
   I tested this code loccally with pytest and pyspark 3.5.0 
   
![image](https://github.com/apache/spark/assets/51126637/3a29a495-38d3-492c-b192-3e26af6fc72c)
   
   
   
   ### Was this patch authored or co-authored using generative AI tooling?
   No
   


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