Lib/test/support: fix typo in docstring (GH-8506)

Lib/test/support/__init__.py

@@ -1955,8 +1955,8 @@ def set_match_tests(patterns):
 
         def match_test_regex(test_id):
             if regex_match(test_id):
-                # The regex matchs the whole identifier like
-                # 'test.test_os.FileTests.test_access'
+                # The regex matches the whole identifier, for example
+                # 'test.test_os.FileTests.test_access'.
                 return True
             else:
                 # Try to match parts of the test identifier.