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


Automerge-Triggered-By: @csabella
(cherry picked from commit b1f160a236cb590b1c1a678ca5fc19d5c75dcd83)

Co-authored-by: Jules Lasne (jlasne) <jules.lasne@gmail.com>
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index eb6714a..a559d09 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)