Grammar and spelling fixes (#16065)

tests/components/test_script.py

@@ -18,7 +18,7 @@ class TestScriptComponent(unittest.TestCase):
 
     # pylint: disable=invalid-name
     def setUp(self):
-        """Setup things to be run when tests are started."""
+        """Set up things to be run when tests are started."""
         self.hass = get_test_home_assistant()
 
     # pylint: disable=invalid-name