Backport PR #16648 on branch v3.2.x (Document filling of Poly3DCollection)#16763

QuLogic merged 1 commit intomatplotlib:v3.2.xmatplotlib/matplotlib:v3.2.xfrom

meeseeksmachine:auto-backport-of-pr-16648-on-v3.2.xmeeseeksmachine/matplotlib:auto-backport-of-pr-16648-on-v3.2.xCopy head branch name to clipboard