[3.10] Fix typos in the Lib directory (GH-28775) (GH-28804)

Fix typos in the Lib directory as identified by codespell.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>.
(cherry picked from commit 745c9d9dfc1ad6fdfdf1d07420c6273ff67fa5be)

Co-authored-by: Christian Clauss <cclauss@me.com>
diff --git a/Lib/test/test_locale.py b/Lib/test/test_locale.py
index 2c788f2..f844e62 100644
--- a/Lib/test/test_locale.py
+++ b/Lib/test/test_locale.py
@@ -496,7 +496,7 @@ def test_japanese(self):
 class TestMiscellaneous(unittest.TestCase):
     def test_defaults_UTF8(self):
         # Issue #18378: on (at least) macOS setting LC_CTYPE to "UTF-8" is
-        # valid. Futhermore LC_CTYPE=UTF is used by the UTF-8 locale coercing
+        # valid. Furthermore LC_CTYPE=UTF is used by the UTF-8 locale coercing
         # during interpreter startup (on macOS).
         import _locale
         import os