Fixed compute_clips docstring

[rsomani95]

dilation was not passed into compute_clips or any of the functions called by it.

[codecov-io]

Codecov Report

Merging #1543 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1543   +/-   ##
======================================
  Coverage    64.6%   64.6%           
======================================
  Files          87      87           
  Lines        6742    6742           
  Branches     1034    1034           
======================================
  Hits         4356    4356           
  Misses       2085    2085           
  Partials      301     301

Impacted Files	Coverage Δ
torchvision/datasets/video_utils.py	72.25% <ø> (ø)	⬆️

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[fmassa]

Thanks