Fix Customizer bean typo in docs

[giger85]

Hi, all

A Customize bean maybe typo in document.
Is Customizer bean right?

[codecov]

Codecov Report

Merging #145 (9f25d0b) into main (8a905ca) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #145   +/-   ##
=========================================
  Coverage     80.80%   80.80%           
  Complexity      108      108           
=========================================
  Files            15       15           
  Lines           375      375           
  Branches         15       15           
=========================================
  Hits            303      303           
  Misses           69       69           
  Partials          3        3           

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