docs(python): Update reference to `apply`

[avimallu]

Closes https://github.com/pola-rs/polars/issues/15945.

Removed the reference to apply as indicated and replaced with map_rows or map_elements as appropriate.

[avimallu]

Test failures unrelated to this PR: Ruff job failed to setup and Code Coverage failed with the error:

Codecov: Failed to properly create commit: The process '/Users/runner/work/_actions/codecov/codecov-action/v4/dist/codecov' failed with exit code 1

[alexander-beedie]

Removed the reference to apply as indicated and replaced with map_rows or map_elements as appropriate.

Nice one; you receive today's "Eye of the Tiger" award 😁🏆

[avimallu]

you receive today's "Eye of the Tiger" award 😁🏆

Haha, full credit goes to @david-waterworth though :)

one small fix is required ;)

Nice catch, have made the update.

Code coverage seems to require a token now, so I guess that will fail until then.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.91%. Comparing base (80233b8) to head (656c422). Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15982   +/-   ##
=======================================
  Coverage   80.91%   80.91%           
=======================================
  Files        1384     1384           
  Lines      178111   178111           
  Branches     3043     3043           
=======================================
+ Hits       144112   144120    +8     
+ Misses      33515    33506    -9     
- Partials      484      485    +1     

Flag	Coverage Δ
python	74.41% <ø> (+0.02%)	:arrow_up:
rust	78.05% <ø> (+<0.01%)	:arrow_up:

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[alexander-beedie]

Thank you both! ✌️