Also adjust alignment a bit to distinguish commented out from comment.
host all all ::1/128 @authmethod@
# Allow replication connections from localhost, by a user with the
# replication privilege.
-# host replication @default_username@ 127.0.0.1/32 @authmethod@
-# host replication @default_username@ ::1/128 @authmethod@
+#local replication @default_username@ @authmethod@
+#host replication @default_username@ 127.0.0.1/32 @authmethod@
+#host replication @default_username@ ::1/128 @authmethod@