Use more canonical imports with io::Result instead of IoResult

[kskalski]

Problem

IoResult use alias is used while a more direct and almost same length reference of io::Result could be used

Summary of Changes

Remove use alias and reference std::io::Result through io import

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.36585% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.3%. Comparing base (40dcedf) to head (71d522c).
⚠️ Report is 3065 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #6754    +/-   ##
========================================
  Coverage    83.3%    83.3%            
========================================
  Files         852      852            
  Lines      377900   377900            
========================================
+ Hits       314944   315128   +184     
+ Misses      62956    62772   -184     

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[brooksprumo]

Thanks for the cleanup!