Backport PR #20913 on branch v3.5.x ([Doc] colors.to_hex input & output) - #21064

Backport PR #20913 on branch v3.5.x ([Doc] colors.to_hex input & output)#21064

dstansby merged 1 commit into

matplotlib:v3.5.xmatplotlib/matplotlib:v3.5.xfrom

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