We do not need to check docs for this project.

--- persistent-6.6/tox.ini.orig
+++ persistent-6.6/tox.ini
@@ -23,10 +23,8 @@
     !pure-!pypy3: PURE_PYTHON=0
 commands =
     zope-testrunner --test-path=src {posargs:-vc}
-    sphinx-build -b doctest -d {envdir}/.cache/doctrees docs {envdir}/.cache/doctest
 extras =
     test
-    docs
 
 [testenv:setuptools-latest]
 basepython = python3