Fix typo in documentation for the extract_patches function.

[himalayo]

I've found a typo in the documentation for the extract_patches function. It said (patches_height, patches_widht) instead of (patches_height, patches_width).
My commit fixes that.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (db456b7) to head (512001b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #20262   +/-   ##
=======================================
  Coverage   78.96%   78.96%           
=======================================
  Files         505      505           
  Lines       48005    48005           
  Branches     8839     8839           
=======================================
  Hits        37906    37906           
  Misses       8294     8294           
  Partials     1805     1805           

Flag	Coverage Δ
keras	78.82% <ø> (ø)
keras-jax	62.23% <ø> (ø)
keras-numpy	57.37% <ø> (-0.01%)	⬇️
keras-tensorflow	63.62% <ø> (ø)
keras-torch	62.27% <ø> (ø)

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