Update formatting targets guide

[ethanwharris]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #1165 (b79863a) into master (3ec0405) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1165      +/-   ##
==========================================
- Coverage   89.26%   89.26%   -0.01%     
==========================================
  Files         286      286              
  Lines       13048    13045       -3     
==========================================
- Hits        11647    11644       -3     
  Misses       1401     1401              

Flag	Coverage Δ
unittests	89.26% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
flash/core/data/utilities/classification.py	98.22% <ø> (ø)
flash/core/data/data_module.py	95.23% <100.00%> (-0.05%)	⬇️

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