Add Documentation for lightly/models/modules

[ayush22iitbhu]

#1687

I have updated the docstrings for the following files:

1. lightly/models/modules/ijepa_timm.py
2. lightly/models/modules/ijepa.py
3. lightly/models/modules/masked_autoencoder_timm.py
4. lightly/models/modules/masked_autoencoder.py
5. lightly/models/modules/masked_casual_vision_transformer.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.90%. Comparing base (9578268) to head (57bb534).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1704   +/-   ##
=======================================
  Coverage   84.90%   84.90%           
=======================================
  Files         156      156           
  Lines        6526     6526           
=======================================
  Hits         5541     5541           
  Misses        985      985           

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