Update vision_transformers.py

[Anirudh257]

Corrected spelling mistake in stride.

Motivation and Context

Not so important. I just corrected a simple spelling mistake.

How Has This Been Tested

No testing required

Types of changes

• Docs change / refactoring / dependency upgrade
• 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)

Checklist

• 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 completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #164 (4df1ca1) into main (874d27c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files         132      132           
  Lines        8306     8306           
=======================================
  Hits         7863     7863           
  Misses        443      443           

Impacted Files	Coverage Δ
pytorchvideo/models/vision_transformers.py	95.74% <100.00%> (ø)

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