Backport PR #20730 on branch v3.5.x (DOC: Add a release mode tag)#21227

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QuLogic merged 1 commit intomatplotlib:v3.5.xfrom

meeseeksmachine:auto-backport-of-pr-20730-on-v3.5.x

Sep 30, 2021

Commits on Sep 30, 2021

Backport PR #20730: DOC: Add a release mode tag

timhoffm
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meeseeksmachine
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