Update rules wrt mastodon

Unless one is mentioned one will not get a push notification so one
should refresh the IOCCC mastodon feed every so often. This is at the
top of the file, though, and seemingly part of a file in inc/ so this
might have to be done differently than how this change was done.

next/rules.md

@@ -17,8 +17,9 @@ the past.
 
 Watch both [the IOCCC status page](../status.html) and the
 [@IOCCC mastodon feed](https://fosstodon.org/@ioccc) for information about
-future IOCCC openings. Please be sure to check the feed every so often as unless
-you are mentioned you will **NOT** get a notification.
+future IOCCC openings. **Please note** that unless you are mentioned you will
+**NOT** get a push notification with the app so you should refresh the feed from
+time to time.
 
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