Update tutorial_classification.md

[puhuk]

Correct minor typo (east -> easy)

Motivation and Context

When I read the tutorial for classification (https://pytorchvideo.org/docs/tutorial_classification), I find out a minor typo so I correct this and request PR.

How Has This Been Tested

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.

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[codecov-commenter]

Codecov Report

Merging #111 (d97b8fa) into master (adf576d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #111   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files         131      131           
  Lines        8102     8102           
=======================================
  Hits         7696     7696           
  Misses        406      406           

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[puhuk]

@kalyanvasudev, @haooooooqi,
Can I contribute to this repository
This time I just correct a typo, but I wanna contribute further.