Backport PR #16272 on branch v3.1.3-doc#16488

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tacaswell merged 1 commit intomatplotlib:v3.1.3-docfrom

QuLogic:auto-backport-of-pr-16272-on-v3.1.3-doc

Feb 16, 2020

Commits on Feb 13, 2020

Backport PR #16272: Move mplot3d autoregistration api changes to 3.2.

dstansby
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QuLogic
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