Update basic_ae_module.py

[dpkpathak]

AE class instantiation is necessary to load pretrained model, as from_pretrained is not a static method.

What does this PR do?

It updates a docstring in the basic_ae_module for AE class, which corrects the required way to instantiate a pretrained autoencoder for cifar.

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[codecov]

Codecov Report

Merging #570 (b046c1e) into master (1bec122) will decrease coverage by 0.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #570      +/-   ##
==========================================
- Coverage   78.03%   77.51%   -0.53%     
==========================================
  Files         115      115              
  Lines        6701     6701              
==========================================
- Hits         5229     5194      -35     
- Misses       1472     1507      +35     

Flag	Coverage Δ
cpu	?
pytest	?
unittests	77.51% <ø> (ø)

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

Impacted Files	Coverage Δ
...ts/models/autoencoders/basic_ae/basic_ae_module.py	88.15% <ø> (ø)
pl_bolts/utils/warnings.py	38.46% <0.00%> (-61.54%)	⬇️
...s/models/detection/components/_supported_models.py	71.42% <0.00%> (-28.58%)	⬇️
pl_bolts/datasets/mnist_dataset.py	36.36% <0.00%> (-9.10%)	⬇️
pl_bolts/models/detection/faster_rcnn/backbones.py	84.61% <0.00%> (-7.70%)	⬇️
pl_bolts/transforms/dataset_normalizations.py	80.00% <0.00%> (-5.00%)	⬇️
pl_bolts/callbacks/vision/image_generation.py	87.87% <0.00%> (-3.04%)	⬇️
..._bolts/models/self_supervised/simclr/transforms.py	75.71% <0.00%> (-2.86%)	⬇️
pl_bolts/datasets/ssl_amdim_datasets.py	73.68% <0.00%> (-2.64%)	⬇️
pl_bolts/models/self_supervised/swav/transforms.py	61.03% <0.00%> (-2.60%)	⬇️
... and 12 more

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[akihironitta]

@dpkpathak The doc is being fixed in #557, so let me close this PR. Thank you for your contribution!