Add doc8 linting

docs/source/dev/registering_plugins.rst

@@ -79,7 +79,7 @@ Note specifically these lines:
         # snip ...
     )
 
-We tell setuptools to register our entry point "X" inside the specific 
+We tell setuptools to register our entry point "X" inside the specific
 grouping of entry-points that flake8 should look in.
 
 Flake8 presently looks at three groups:

tox.ini

@@ -36,6 +36,17 @@ deps =
 commands =
     pylint flake8
 
+[testenv:doc8]
+basepython = python3
+skipsdist = true
+skip_install = true
+use_develop = false
+deps =
+    sphinx
+    doc8
+commands =
+    doc8 docs/source/
+
 [testenv:mypy]
 basepython = python3
 skipsdist = true