Fix docstring markup in sage/tests except sage/tests/book_stein_modform.py #34166
Description
Part of #34157:
sage/tests/benchmark.py:68:1: RST203 Definition list ends without a blank line; unexpected unindent.
sage/tests/article_heuberger_krenn_kropf_fsm-in-sage.py:10:1: RST301 Unexpected indentation.
sage/tests/article_heuberger_krenn_kropf_fsm-in-sage.py:13:1: RST201 Block quote ends without a blank line; unexpected unindent.
sage/tests/gosper-sum.py:2:1: RST399 Document or section may not begin with a transition.
Component: documentation
Author: Frédéric Chapoton
Branch/Commit: 24e01a2
Reviewer: Matthias Koeppe
Issue created by migration from https://trac.sagemath.org/ticket/34166