Fix typo found by Min ho Kim (#14879)
diff --git a/Lib/idlelib/help.py b/Lib/idlelib/help.py
index 652444a..e19d361 100644
--- a/Lib/idlelib/help.py
+++ b/Lib/idlelib/help.py
@@ -257,7 +257,7 @@
same, help.html can be backported. The internal Python version
number is not displayed. If maintenance idle.rst diverges from
the master version, then instead of backporting help.html from
- master, repeat the proceedure above to generate a maintenance
+ master, repeat the procedure above to generate a maintenance
version.
"""
src = join(abspath(dirname(dirname(dirname(__file__)))),