no-issue: Fix typo TestContentTyopeHeader to TestContentTypeHeader (gh-109069)

Author: jenner9212

Lib/test/test_email/test_email.py

@@ -2236,7 +2236,7 @@ def test_multipart_valid_cte_no_defect(self):
                     "\nContent-Transfer-Encoding: {}".format(cte)))
             self.assertEqual(len(msg.defects), 0)
 
-    # test_headerregistry.TestContentTyopeHeader invalid_1 and invalid_2.
+    # test_headerregistry.TestContentTypeHeader invalid_1 and invalid_2.
     def test_invalid_content_type(self):
         eq = self.assertEqual
         neq = self.ndiffAssertEqual