Add missing comma and period in unittest docs (GH-17211)



Automerge-Triggered-By: @csabella
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 9e66a2c..e2e4f2c 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -1563,7 +1563,7 @@
       if __name__ == "__main__":
           unittest.main()
 
-   After running the test ``events`` would contain ``["setUp", "asyncSetUp", "test_response", "asyncTearDown", "tearDown", "cleanup"]``
+   After running the test, ``events`` would contain ``["setUp", "asyncSetUp", "test_response", "asyncTearDown", "tearDown", "cleanup"]``.
 
 
 .. class:: FunctionTestCase(testFunc, setUp=None, tearDown=None, description=None)