Update comments for the xmlNewDecoder

[match-meng]

PR Details

Description

Related Issue

Motivation and Context

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #542 into master will decrease coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #542      +/-   ##
==========================================
- Coverage    95.8%   95.78%   -0.02%     
==========================================
  Files          28       28              
  Lines        5838     5840       +2     
==========================================
+ Hits         5593     5594       +1     
- Misses        134      135       +1     
  Partials      111      111

Impacted Files	Coverage Δ
xmlWorksheet.go	100% <ø> (ø)	⬆️
excelize.go	90.8% <ø> (ø)	⬆️
sheet.go	94.38% <100%> (ø)	⬆️
rows.go	87.17% <66.66%> (-0.28%)	⬇️

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