[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/email/errors.py b/Lib/email/errors.py
index 1d258c3..3ad0056 100644
--- a/Lib/email/errors.py
+++ b/Lib/email/errors.py
@@ -110,4 +110,4 @@ class NonASCIILocalPartDefect(HeaderDefect):
     # parsing messages decoded from binary.
 
 class InvalidDateDefect(HeaderDefect):
-    """Header has unparseable or invalid date"""
+    """Header has unparsable or invalid date"""