docs: improve example output for replaceSymbols

[matthewmayer]

found while testing #3301

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (01e20e9) to head (e905bb1).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3304      +/-   ##
==========================================
- Coverage   99.96%   99.96%   -0.01%     
==========================================
  Files        2806     2806              
  Lines      217140   217140              
  Branches      977      978       +1     
==========================================
- Hits       217074   217062      -12     
- Misses         66       78      +12     

Files with missing lines	Coverage Δ
src/modules/helpers/index.ts	96.71% <ø> (ø)

... and 2 files with indirect coverage changes