docs: use initialValues prop in sample code

[actus-wirtenberger]

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Name	Status	Preview	Updated
felte-docs	✅ Ready (Inspect)	Visit Preview	Oct 1, 2022 at 10:10PM (UTC)

[codecov-commenter]

Codecov Report

Merging #178 (7da37cd) into main (7db7c55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #178   +/-   ##
=======================================
  Coverage   99.34%   99.34%           
=======================================
  Files          84       84           
  Lines        2439     2439           
  Branches      643      643           
=======================================
  Hits         2423     2423           
  Misses         16       16           

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