docs: fix definition names in 'Company Name Affix files reorganized' section of migration guide

[matthewmayer]

Fixes incorrect file names

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (dfbf6c4) to head (a225054).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3125      +/-   ##
==========================================
- Coverage   99.97%   99.96%   -0.02%     
==========================================
  Files        2776     2776              
  Lines      226341   226341              
  Branches      945      941       -4     
==========================================
- Hits       226289   226265      -24     
- Misses         52       76      +24     

see 1 file with indirect coverage changes