apt.cron.daily: Reference 10periodic instead of 02periodic

LP: #1332106

debian/apt.cron.daily

@@ -3,7 +3,7 @@
 #
 # This file understands the following apt configuration variables:
 # Values here are the default.
-# Create /etc/apt/apt.conf.d/02periodic file to set your preference.
+# Create /etc/apt/apt.conf.d/10periodic file to set your preference.
 #
 #  Dir "/";
 #  - RootDir for all configuration files