Improve make_grid docs

[ssnl]

add default values
mention range in normalize doc

[codecov-io]

Codecov Report

Merging #964 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
- Coverage   60.03%   59.97%   -0.06%     
==========================================
  Files          64       64              
  Lines        5054     5054              
  Branches      754      754              
==========================================
- Hits         3034     3031       -3     
- Misses       1817     1819       +2     
- Partials      203      204       +1

Impacted Files	Coverage Δ
torchvision/utils.py	61.53% <ø> (ø)	⬆️
torchvision/transforms/transforms.py	81.89% <0%> (-0.65%)	⬇️

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