Fix source comment typo

[luzpaz]

Attributess->Attributes

[codecov]

Codecov Report

Merging #1663 (fa64032) into master (4f059f2) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1663      +/-   ##
==========================================
+ Coverage   97.58%   97.68%   +0.10%     
==========================================
  Files          66       66              
  Lines       10712    10712              
==========================================
+ Hits        10453    10464      +11     
+ Misses        259      248      -11     

Impacted Files	Coverage Δ
pydicom/pixel_data_handlers/numpy_handler.py	100.00% <ø> (ø)
pydicom/multival.py	100.00% <100.00%> (ø)
pydicom/valuerep.py	99.55% <0.00%> (+0.14%)	⬆️
pydicom/filewriter.py	98.06% <0.00%> (+0.24%)	⬆️
pydicom/filereader.py	94.62% <0.00%> (+0.25%)	⬆️
pydicom/uid.py	100.00% <0.00%> (+1.09%)	⬆️
pydicom/filebase.py	99.19% <0.00%> (+1.61%)	⬆️

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