Issue #28303: Fix grammar in unittest.__doc__, patch by Shlomi Fish

Lib/unittest/__init__.py

@@ -12,7 +12,7 @@ Simple usage:
     import unittest
 
     class IntegerArithmeticTestCase(unittest.TestCase):
-        def testAdd(self):  ## test method names begin 'test*'
+        def testAdd(self):  # test method names begin with 'test'
             self.assertEqual((1 + 2), 3)
             self.assertEqual(0 + 1, 1)
         def testMultiply(self):