Update and improve roxygen2 documentation

[lcgodoy]

This pull request updates the roxygen2 documentation across several R files in the drmr package.

Changes include:

• R/model-run.R: Fixed typos, clarified init parameter options, and improved return value descriptions for fit_drm and fit_sdm.
• R/make-data.R: Corrected grammar in parameter descriptions and fixed typos in .toggles documentation. Removed inapplicable toggles from make_data_sdm documentation.
• R/predict.R: Fixed typos and clarified new_data and past_data usage. Updated predict.sdm documentation to accurately reflect its arguments.
• R/methods.R: Cleaned up documentation for S3 methods (update, print, summary, draws), including removing duplicate author tags and fixing parameter descriptions.
• R/generics.R: Corrected the description of sdm in new_sdm (Species Distribution Model).
• R/defaults.R: Replaced placeholder return value descriptions with meaningful text.
• R/utils.R: Improved return value descriptions and clarified the alpha parameter in int_score.

These changes aim to improve the correctness, clarity, and conciseness of the package documentation. Note that the documentation (man/ files) needs to be regenerated using roxygen2::roxygenize() as the environment did not support running R.

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PR created automatically by Jules for task 12729099472964578122 started by @lcgodoy

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