MAINT: Correct variable name

[Zeroto521]

• closes #xxxx
• whatsnew entry

DataFrmae -> DataFrame

[codecov]

Codecov Report

Merging #573 (ecffe2b) into main (6323df1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #573   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          78       78           
  Lines         912      912           
  Branches      101      101           
=======================================
  Hits          908      908           
  Misses          1        1           
  Partials        3        3           

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

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