Fix typos in docs, comments and test assert messages (#14872)

diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index c9e6e7d..fb76144 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -1161,7 +1161,7 @@
 
         # These next lines contains tabs.  Backslash escapes don't
         # work in f-strings.
-        # patchcheck doens't like these tabs.  So the only way to test
+        # patchcheck doesn't like these tabs.  So the only way to test
         # this will be to dynamically created and exec the f-strings.  But
         # that's such a hassle I'll save it for another day.  For now, convert
         # the tabs to spaces just to shut up patchcheck.