Fix documentation of Field's constructor

[bblanchon]

The documentation of kwargs for Field's constructor was incorrect.
It said that the attributes are added to the <div>, but they are actually added to the <input>.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d50351) 89.30% compared to head (e6fed4f) 89.30%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1375   +/-   ##
=======================================
  Coverage   89.30%   89.30%           
=======================================
  Files          12       12           
  Lines        1010     1010           
  Branches      192      192           
=======================================
  Hits          902      902           
  Misses         78       78           
  Partials       30       30           

Flag	Coverage Δ
unittests	89.30% <ø> (ø)

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Files	Coverage Δ
crispy_forms/layout.py	84.73% <ø> (ø)

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