fix silly next/rules.md modification

It turned out that `next/rules.md` was modified in the section marked
between:

```html
<!-- START: this line starts content from: inc/rules.closed.hdr -->
```

and:

```html
<!-- END: the next line ends content from: inc/rules.closed.hdr -->
```

Instead, `inc/{guidelines,rules}.*.hdr` should be modified as
 `make gen_status` uses these files to form this content.

inc/rules.open.hdr

@@ -8,9 +8,12 @@ Unless some significant problem turns up (such as a need to delay
 in when the IOCCC will close, or some major bug is discovered) they
 will remain **OFFICIAL** for this IOCCC.
 
-See our [FAQ about providing feedback](../faq.html#feedback) as well
-as our [FAQ about asking questions](../faq.html#question) about
-these guidelines.
+See our
+FAQ on "[rules, guidelines, tools feedback](../faq.html#feedback)"
+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 on "[how to enter the IOCCC](../faq.html#enter)".
 
 **SUGGESTION**: Watch both the [IOCCC news](../news.html) and the
 [IOCCC Mastodon](https://fosstodon.org/@ioccc) feed for the latest news