change various use of #submit to #enter

inc/rules.closed.hdr

@@ -15,7 +15,7 @@ as well as our
 FAQ on "[about asking questions](../faq.html#question)"
 about these rules. You might also find the
 FAQ in general useful, especially the
-[FAQ section "How to enter: the bare minimum you need to know"](../faq.html#submit).
+[FAQ section "How to enter: the bare minimum you need to know"](../faq.html#enter).
 
 Watch both [the IOCCC status page](../status.html) and the
 [@IOCCC mastodon feed](https://fosstodon.org/@ioccc) for information about