TYP: specific None type using

[Zeroto521]

• closes TYP: specific None type #466
• whatsnew entry

update documentation

[codecov]

Codecov Report

Merging #467 (9ba513e) into main (41a34da) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          24       24           
  Lines         612      612           
  Branches       81       81           
=======================================
  Hits          609      609           
  Misses          1        1           
  Partials        2        2           

Impacted Files	Coverage Δ
dtoolkit/accessor/series.py	100.00% <ø> (ø)

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