Issue #24435: Use the devguide link instead of PEP 306 in Grammar/Grammar.
diff --git a/Grammar/Grammar b/Grammar/Grammar
index d7aaffd..05c3181 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -7,8 +7,8 @@
# with someone who can; ask around on python-dev for help. Fred
# Drake <fdrake@acm.org> will probably be listening there.
-# NOTE WELL: You should also follow all the steps listed in PEP 306,
-# "How to Change Python's Grammar"
+# NOTE WELL: You should also follow all the steps listed at
+# https://docs.python.org/devguide/grammar.html
# Start symbols for the grammar:
# single_input is a single interactive statement;