Inconsistency between SplitConformalRegressor default value for prefit in code and documentation

[TristanRss-datategy]

Hi 👋,

I noticed an inconsistency between the default value of the prefit parameter in SplitConformalRegressor:

In the documentation, the default value is shown as False.

But in the actual implementation, the default value appears to be True.

This can be confusing for users relying on the documentation. Could you clarify which one is intended, and align the doc/code accordingly?

Thanks a lot for your work on MAPIE!

[FaustinPulveric]

Hello @TristanRss-datategy! Good catch, thanks for the issue! :) The implementation was correct here: we want to set the prefit value to True by default.
I just fixed the docstrings accordingly in this PR.