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Document that get_cmap returns a copy now

This was put into effect in#22298, but was not given an API note.

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	`1`	+``plt.get_cmap`` and ``matplotlib.cm.get_cmap`` return a copy
	`2`	`+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
	`3`	`+`
	`4`	+Formerly, `~.pyplot.get_cmap` and `.cm.get_cmap` returned a global version of a
	`5`	+`.Colormap`. This was prone to errors as modification of the colormap would
	`6`	`+propagate from one location to another without warning. Now, a new copy of the`
	`7`	`+colormap is returned.`

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