GeezerVison

Two Parameters entries name an argument the function does not take.

• ControlPlot.set_plot_title documents fig, but the method is (self, title, frame='axes') and uses self.figure, so there is no way to pass it. The whole Parameters block came across from suptitle(), which is deprecated in favour of this method and does take fig.
• phase_plot documents func; the parameter was renamed to odefun, so phase_plot(func=...) raises TypeError. The usage lines above it still read phase_plot(func, ...), which works because that form is positional.

One thing I did not change, because it is your call rather than mine. The same block documents **kwargs : matplotlib.pyplot.suptitle keywords, optional, and set_plot_title neither accepts nor forwards them: the body calls _update_plot_title(title, fig=self.figure, frame=frame, use_existing=False). So deprecating suptitle dropped that passthrough. Removing the entry and restoring the passthrough are both defensible, and the second is a behaviour change, so I left it alone. Happy to follow up with whichever you prefer.

Docstrings only. ruff check control/ctrlplot.py control/phaseplot.py passes.