Infra: Fix URLs in python-releases.toml and api/index.rst (#4876)

Author: m-aciek

peps/api/index.rst

@@ -212,4 +212,4 @@ release-schedule.ics
 --------------------
 
 An iCalendar file of Python release dates is available at
-https://peps.python.org/api/release-schedule.ics.
+https://peps.python.org/release-schedule.ics.

release_management/python-releases.toml

@@ -13,8 +13,8 @@
 #    python -m release_management update-peps
 #
 # The PEP rendering system, via Sphinx, uses this document to regenerate the
-# 'release-cycle' JSON file, found at https://peps.python.org/release-cycle.json,
-# and a full JSON representation at https://peps.python.org/python-releases.json,
+# 'release-cycle' JSON file, found at https://peps.python.org/api/release-cycle.json,
+# and a full JSON representation at https://peps.python.org/api/python-releases.json,
 # This 'release-cycle' JSON file is intended for public consumption. The format
 # of this TOML document is not guaranteed and may change without notice.