gh-110383: Changed the doc for str.rsplit from 'starting from the left' to 'starting from the right'

[Unique-Usman]

Changed the doc for str.rsplit to be from 'starting from the left' to 'starting from the right' as str.rsplit start from the right

[erlend-aasland]

You need to change the clinic input code in Objects/unicodeobject.c. Directly manipulating the clinic output (anything that lives inside a clinic/ directory) will never work; future updates to the clinic input would overwrite such a change, but you'd never be able to check in such a change because we've got CI checks to prevent changes to generated code (see the "Check if generated files are up to date" CI check).

There's an Argument Clinic How-to in the devguide. I suggest you start with that, and then retarget this PR to change Objects/unicodeobject.c instead.

[Unique-Usman]

Yeah @erlend-aasland thanks for the suggestion, I will look into it.

[sparrowt]

Looks like it's this line specifically the = str.split on the end that is "cloning" the per-parameter docstrings from split onto rsplit.

Given the docs say:

Sorry, there’s no syntax for partially cloning a function, or cloning a function then modifying it. Cloning is an all-or nothing proposition.

it seems like the only option is to stop cloning and then copy-paste the parameter docstrings from splithere into rsplithere.

[sparrowt]

I've opened #113353 which hopefully does the right thing

[erlend-aasland]

I propose a different approach in #113355.