Cleanup docstrings in lightly/utils subpackage

[HarshitVashisht11]

fixes #1675

[MalteEbner]

Thanks for your PR!

Two geral comments:

• Please focus on updating docstrings or error strings. Logic changes, if any, should be done in separate PRs. It also makes this easier to approved and get merged :)
• Before any commit, format the code using the auto formatter. See the contribution docs.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.86%. Comparing base (e80dda7) to head (664e6c4).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
lightly/utils/embeddings_2d.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1698      +/-   ##
==========================================
+ Coverage   84.85%   84.86%   +0.01%     
==========================================
  Files         155      155              
  Lines        6509     6508       -1     
==========================================
  Hits         5523     5523              
+ Misses        986      985       -1     

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[MalteEbner]

Thank you very much for updating the PR @HarshitVashisht11 !

Only a few last points, then this is ready to merge :)
Also don't to forget to run make format before any commits.

[MalteEbner]

Thanks for your update!

Your formatter seems to have a different version than the required one, I fixed it and pushed.

Let's get this merged :)