docs(image): improve urlPlaceholder alternatives

[ST-DDT]

Explicitly lists dataUri as alternative for the deprecated urlPlaceholder.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (637f81b) to head (b386d31).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3351      +/-   ##
==========================================
- Coverage   99.97%   99.97%   -0.01%     
==========================================
  Files        2811     2811              
  Lines      217023   217023              
  Branches      942      941       -1     
==========================================
- Hits       216972   216966       -6     
- Misses         51       57       +6     

Files with missing lines	Coverage Δ
src/modules/image/index.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes