Fix SDF typo.

[robertwb]

R: @riteshghorse

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[riteshghorse]

Thanks for fixing this!

[codecov]

Codecov Report

Merging #25765 (f4a0cbf) into master (5d1bcfb) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #25765      +/-   ##
==========================================
- Coverage   72.82%   72.82%   -0.01%     
==========================================
  Files         775      775              
  Lines      102936   102936              
==========================================
- Hits        74962    74958       -4     
- Misses      26520    26524       +4     
  Partials     1454     1454              

Flag	Coverage Δ
python	81.96% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/localfilesystem.py	90.97% <0.00%> (-0.76%)	⬇️
...python/apache_beam/runners/worker/worker_status.py	74.66% <0.00%> (-0.67%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	94.10% <0.00%> (-0.24%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.35% <0.00%> (ø)

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