DOC: add blank line

[Zeroto521]

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[codecov]

Codecov Report

Merging #262 (09c9d09) into master (fd8beae) will decrease coverage by 1.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #262      +/-   ##
==========================================
- Coverage   99.64%   98.05%   -1.60%     
==========================================
  Files          23       23              
  Lines         565      565              
  Branches       61       61              
==========================================
- Hits          563      554       -9     
- Misses          0        6       +6     
- Partials        2        5       +3     

Impacted Files	Coverage Δ
dtoolkit/accessor/dataframe.py	93.90% <ø> (-3.66%)	⬇️
dtoolkit/accessor/series.py	95.83% <ø> (-4.17%)	⬇️
dtoolkit/transformer/sklearn.py	100.00% <ø> (ø)
dtoolkit/accessor/_util.py	80.00% <0.00%> (-20.00%)	⬇️

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