Add documentation for ppc_data and ppc_loo_pit_data#426

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utkarshpawade wants to merge 3 commits intostan-dev:masterfrom

utkarshpawade:fix-209-ppc-data-docs

Commits on Feb 26, 2026

Add documentation for ppc_data and ppc_loo_pit_data
utkarshpawade
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Replaced all ppc_*() functions with many ppc_*() for accuracy, corrected the return type to data frame, and refined wording to avoid overclaiming functionality
utkarshpawade
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Commits on Feb 28, 2026

Merge upstream/master and resolve NEWS.md conflict
utkarshpawade
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