bpo-30737: Update DevGuide links to new URL (GH-3228)

Update old devguide links from https://docs.python.org/devguide to https://devguide.python.org
diff --git a/Misc/Porting b/Misc/Porting
index c43b112..f16c460 100644
--- a/Misc/Porting
+++ b/Misc/Porting
@@ -1 +1 @@
-This document is moved to https://docs.python.org/devguide/faq.html#how-do-i-port-python-to-a-new-platform
+This document is moved to https://devguide.python.org/porting/