[doc] Brief note about expectile margin output.#12243
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Pull request overview
This PR updates the expectile-loss parameter documentation to clarify behavior when using multiple expectile_alpha values and to add an explanation about “raw margin” outputs.
Changes:
- Splits/extends the existing note for
expectile_alphato add more guidance for multiple alphas. - Adds a statement about curve crossing and attempts to explain what “raw margin output” represents for expectile regression.
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