Originated from #30448.

We fix

​https://github.com/sagemath/sagetrac-mirror/runs/7294638131?check_suite_focus=true

by chunks through

• Fix docstring markup in sage/game_theory #34156: sage/game_theory
• Fix docstring markup in sage/manifolds #34158: sage/manifolds
• Fix docstring markup in sage/modular #34159: sage/modular
• Fix docstring markup in sage/schemes #34160: sage/schemes
• Fix docstring markup in sage/databases #34161: sage/databases
• Fix docstring markup in sage/doctest #34162: sage/doctest
• Fix docstring markup in sage/interfaces #34163: sage/interfaces
• Fix docstring markup in sage/plot and sage/graphs #34164: sage/plot, sage/graphs
• Fix docstring markup in sage/tests/book_stein_modform.py #34165: sage/tests/book_stein_modform.py
• Fix docstring markup in sage/tests except sage/tests/book_stein_modform.py #34166: sage/tests except sage/tests/book_stein_modform.py
• Fix docstring markup in sage/matroids, sage/geometry, sage/modules #34167: sage/matroids, sage/geometry, sage/modules
• Fix docstring markup in sage/categories #34168: sage/categories
• Fix docstring markup in sage/interacts and sage/rings #34169: sage/interacts and sage/rings
• Fix docstring markup in sage/coding #34170: sage/coding
• Fix docstring markup in sage/combinat #34171: sage/combinat
• Fix docstring markup in sage/groups and sage/misc #34172: sage/groups, sage/misc

and a few commits that finish the job here on the ticket.

Depends on #30448
Depends on #34156
Depends on #34158
Depends on #34159
Depends on #34160
Depends on #34161
Depends on #34162
Depends on #34163
Depends on #34164
Depends on #34165
Depends on #34166
Depends on #34167
Depends on #34168
Depends on #34169
Depends on #34170
Depends on #34171
Depends on #34172
Depends on #34139

CC: @tscrim @fchapoton

Component: documentation

Author: Matthias Koeppe

Branch/Commit: 3b9399d

Reviewer: Kwankyu Lee

Issue created by migration from https://trac.sagemath.org/ticket/34157