docs(Readme): update toPixelData snippet to use width

[eddhurst]

Description

Minor docs bug that left me scratching my head for a minute, when trying to use toPixelData the snippet loops over the Y axis and then the X axis, however in the loop the wrong axis is used as the base, leading to mis-calculating the pixel at the XY coordinate.

Every Y loop, we want to skip an entire row, so we need to multiply by the width of the image, not the height

Motivation and Context

I replicated by making a simple 6x2 r/g/b demo here, which then helped to isolate that the pixels were being read incorrectly.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[biiibooo]

👋 @eddhurst

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.50%. Comparing base (d9b2fcf) to head (9f50c80).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #526   +/-   ##
=======================================
  Coverage   66.50%   66.50%           
=======================================
  Files          10       10           
  Lines         612      612           
  Branches      150      150           
=======================================
  Hits          407      407           
  Misses        144      144           
  Partials       61       61           

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