Enhance docstring for frequency plot function added doc string #826

[sallykinyua]

Added a complete docstring to plot_frequencies_time_series() in malariagen_data/anoph/frq_base.py, which previously had no documentation.

Issue #826 reported that there was no explanation of what the error bars represent in plot_frequencies_time_series(). Although the issue is now closed, the docstring was still missing from the codebase. This PR addresses that gap.

• frq_base.py — added full numpydoc-style docstring to plot_frequencies_time_series() including Parameters, Returns, and a Notes section explaining that error bars represent 95% confidence intervals (Wilson score interval method) where CI data are available, and are absent otherwise.

Documentation only — no functional code was changed.

Fixes #826

[sallykinyua]

Hi @jonbrenas I have fixed the issue on documentation in #826 but after completing i cant find it on the issues. I would also like a review

[sallykinyua]

Hi @jwgarber I would like your opinion

[jwgarber]

It looks like this function is using the @doc annotation from the numpydoc_decorator package, it may not be necessary to have both the annotation and the docstring. E.g. here is some of the existing documentation (I assume the @doc annotation generates this.)