doc updates

[ananyahjha93]

What does this PR do?

Fixes #499

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• Did you write any new necessary tests? [not needed for typos/docs]
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[codecov]

Codecov Report

Merging #530 (483328b) into master (268df20) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #530      +/-   ##
==========================================
- Coverage   77.55%   77.21%   -0.35%     
==========================================
  Files         114      114              
  Lines        6670     6680      +10     
==========================================
- Hits         5173     5158      -15     
- Misses       1497     1522      +25     

Flag	Coverage Δ
cpu	25.88% <ø> (+0.01%)	⬆️
pytest	25.88% <ø> (+0.01%)	⬆️
unittests	76.96% <ø> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pl_bolts/callbacks/variational.py	82.75% <0.00%> (-13.16%)	⬇️
pl_bolts/callbacks/byol_updates.py	95.83% <0.00%> (-4.17%)	⬇️
pl_bolts/optimizers/lars_scheduling.py	74.46% <0.00%> (-2.90%)	⬇️
..._bolts/models/self_supervised/moco/moco2_module.py	70.62% <0.00%> (-1.00%)	⬇️
pl_bolts/datasets/ssl_amdim_datasets.py	75.34% <0.00%> (-0.98%)	⬇️
pl_bolts/datasets/imagenet_dataset.py	19.29% <0.00%> (-0.36%)	⬇️
pl_bolts/models/rl/common/gym_wrappers.py	85.15% <0.00%> (-0.34%)	⬇️
...lts/models/self_supervised/simclr/simclr_module.py	72.41% <0.00%> (-0.27%)	⬇️
pl_bolts/losses/self_supervised_learning.py	71.15% <0.00%> (-0.19%)	⬇️
...ts/models/autoencoders/basic_ae/basic_ae_module.py	88.00% <0.00%> (-0.16%)	⬇️
... and 4 more

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[Borda]

lets have it tested...