DOC: move usage tutorial info to Users guide rst#21335

Merged

timhoffm merged 7 commits intomatplotlib:masterfrom

jklymak:doc-move-backend

Oct 14, 2021

Commits on Oct 11, 2021

DOC: move usage tutorial info to Users guide rst [skip actions] [skip azp]
jklymak
committed

Commits on Oct 12, 2021

DOC: move usage tutorial info to Users guide rst [skip actions] [skip azp] [skip appveyor]
jklymak
committed