docs(python): Remove unwanted linebreaks from docstrings

[bertiewooster]

By changing double backslashes to single backslashes to prevent unwanted linebreak. Fixes #14454. Applies to Series.bottom_k, Series.top_k, Expr.bottom_k and Expr.top_k. I searched the Python and Rust files and did not notice any other instances where this change seemed to be needed.

[bertiewooster]

I notice that the Rust and Python CI code coverage checks failed; they seem to be for technical reasons, namely a lack of credentials, unrelated to the content of this PR:

Error: Codecov token not found. Please provide Codecov token with -t flag.
Error: Codecov: Failed to properly create commit: The process '/Users/runner/work/_actions/codecov/codecov-action/v4/dist/codecov' failed with exit code 1

[orlp]

Thanks for the PR!

[bertiewooster]

@orlp thanks for reviewing it so quickly! I notice that the changes are already live on the dev site for polars.Expr.bottom_k, polars.Series.bottom_k, polars.Expr.top_k, and polars.Series.top_k.

I assume the changes will be reflected in the stable site upon the next release for pages polars.Expr.bottom_k, polars.Series.bottom_k, polars.Expr.top_k, and polars.Series.top_k. Which will probably be quite soon given Polars' impressive release pace! ;)

[bertiewooster]

Indeed the changes are live on the default docs pages due to the recent release. Great!