Add missing final comments to top README.md files

In some cases the comments were there but there was no section heading.
In others the section was not there at all.

These files have NOT been checked in other ways. That will come another
day most likely and very possibly not until early next year.

1998/README.md

@@ -122,6 +122,9 @@ The next IOCCC is planned to start towards the end of 1999.  Watch
 
 for news of the next contest.
 
+
+## Final Comments
+
 **IMPORTANT NOTE**: The email addresses found above are for historical
 purposes only, and should not be used today.  See
 [contact.html](/contact.html) for up to date contact details