docs(python): Fix incorrect stated value of include_nulls in DataFrame.update docstring

[bertiewooster]

Change from False to True in

Use include_nulls=True to overwrite values in this frame with null values in the other frame.

Fixes #16379. Documentation is at https://docs.pola.rs/py-polars/html/reference/dataframe/api/polars.DataFrame.update.html#polars.DataFrame.update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.49%. Comparing base (c506d1f) to head (a25c344).
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Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16701      +/-   ##
==========================================
+ Coverage   81.47%   81.49%   +0.02%     
==========================================
  Files        1416     1416              
  Lines      186889   186906      +17     
  Branches     3021     3026       +5     
==========================================
+ Hits       152259   152313      +54     
+ Misses      34097    34060      -37     
  Partials      533      533              

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[stinodego]

Thanks for the fix! The docstring was indeed incorrect.

I opted to remove that paragraph altogether and move the description to the parameter description, where it should be.