Fix ppc-distribution docs for argument usage & correct test function (#366)

[utkarshpawade]

Fixes #366

This PR addresses the documentation and testing issues in ppc-distribution:

Documentation improvements:

• Clarified that binwidth, bins, and breaks arguments are passed to ggplot2::geom_area() and ggdist::stat_dots() in addition to ggplot2::geom_histogram()
• Clarified that freq argument applies to frequency polygons in addition to histograms

Test fix:

• Fixed test in test-ppc-distributions.R that incorrectly used ppc_dens() instead of ppd_dens() when testing PPD versions of functions

Testing:

• All tests in test-ppc-distributions.R pass (111 PASS | 0 FAIL)
• All documented functions work correctly with the updated parameters
• Documentation regenerated successfully

[Copilot]

Pull request overview

This PR attempts to fix documentation and testing issues in the bayesplot package related to PPC distribution functions. The PR correctly identifies and fixes a test bug, and correctly updates the freq parameter documentation. However, it introduces critical inaccuracies in the documentation for binwidth, bins, and breaks parameters.

Changes:

• Fixed test function that incorrectly used ppc_dens() instead of ppd_dens() for PPD function testing
• Updated freq parameter documentation to clarify it applies to frequency polygons in addition to histograms
• Attempted to update binwidth, bins, and breaks parameter documentation (but with inaccuracies)

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/testthat/test-ppc-distributions.R	Correctly fixes test to use ppd_dens() instead of ppc_dens() when testing PPD versions
man-roxygen/args-hist-freq.R	Correctly updates freq parameter documentation to include frequency polygons
man-roxygen/args-hist.R	Attempts to document binwidth, bins, breaks for multiple geoms, but contains critical inaccuracies
man/*.Rd	Regenerated documentation files reflecting the changes in the templates
NEWS.md	Documents the changes made in this PR

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.63%. Comparing base (306c92e) to head (57b0cc1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #424      +/-   ##
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- Coverage   98.66%   98.63%   -0.04%     
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  Files          35       35              
  Lines        5860     5860              
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- Hits         5782     5780       -2     
- Misses         78       80       +2     

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[jgabry]

Thanks, this looks good. The unit tests are failing on ubuntu-latest (devel) but sometimes this happens on r-devel. We have visual tests that compare SVGs and they are very sensitive. Nothing here should affect those, so we can merge this.