docs(python): Add "coming from pandas" note to DataFrame.unique docstring

[MarcoGorelli]

The most upvoted SO Polars question is about drop_duplicates: https://stackoverflow.com/questions/71196661/what-is-the-equivalent-of-dataframe-drop-duplicates-from-pandas-in-polars

Let's insert a cheeky drop_duplicates mention so that people can be directed to the Polars equivalent 😎

[mcrumiller]

Maybe remove the "though" and just say "Note that..."? The "though" feels a bit awkward.

[stinodego]

I think it's indeed a good idea to mention drop_duplicates here. But I think the note can be a lot shorter and just mention "This method is similar to drop_duplicates in pandas.". Do we need two code blocks here?

[MarcoGorelli]

sure thing, thanks, have shortened

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.85%. Comparing base (88cfb23) to head (63daa27).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17119      +/-   ##
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- Coverage   80.88%   80.85%   -0.03%     
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  Files        1456     1456              
  Lines      191155   191311     +156     
  Branches     2731     2737       +6     
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+ Hits       154611   154684      +73     
- Misses      36038    36121      +83     
  Partials      506      506              

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