[DOC] Update typo in docs example of structs_column_wrapper

[karthikeyann]

Replace struct_column_wrapper with structs_column_wrapper in example given in documentation of structs_column_wrapper

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (f281b90) 85.90% compared to head (e3fd77e) 85.89%.
Report is 10 commits behind head on branch-24.04.

Files	Patch %	Lines
python/cudf/cudf/core/dataframe.py	87.50%	1 Missing ⚠️
python/cudf/cudf/core/frame.py	0.00%	1 Missing ⚠️
python/cudf/cudf/core/indexed_frame.py	0.00%	1 Missing ⚠️
python/cudf/cudf/core/series.py	50.00%	1 Missing ⚠️
python/cudf/cudf/io/hdf.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.04   #14949      +/-   ##
================================================
- Coverage         85.90%   85.89%   -0.01%     
================================================
  Files               175      175              
  Lines             27428    27429       +1     
================================================
- Hits              23562    23561       -1     
- Misses             3866     3868       +2     

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[karthikeyann]

/merge