Most of its uses should be replaced by # optional - sage_spkg

Depends on #32759

CC: @jhpalmieri @kiwifb @seblabbe @antonio-rojas

Component: doctest framework

Author: Matthias Koeppe

Branch/Commit: 9f76647

Reviewer: John Palmieri, François Bissey, Antonio Rojas

Issue created by migration from https://trac.sagemath.org/ticket/32856