Clarify semantics of plt.matshow(..., fignum=...). #27244
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The semantics of the fignum parameter are rather confusing, per #22972 (in particular wrt. whether the figure gets resized or not -- it only does if fignum=(None or a non-existing figure number) (which creates a new figure), but not if fignum=0 (which also creates a new figure).
It's probably not worth fixing that (if anything we should just point users to Axes.matshow, which is just fine), but we can still improve the documentation.
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