Minor fix in years-spoiler.html

There was a reference to Leo's fix to 1992/albert but although the
source code exists by the name given the email message did not. It
referred to 1992/albert/albert.fix.hint which did not exist. Previously
the README.md was actually that meant that the real entry README.md was
not generated into a html file. Thus I renamed the two files but only
now noticed that it's referenced in years-spoiler.html. I've renamed the
albert.bug.md to be albert.fix.hint.md to match the years-spoiler.html
wording (certainly another form could be contrived) but make it a
markdown file (even though it's not one).

years-spoiler.html

@@ -2943,7 +2943,7 @@ since it doesn't check the number for factors 2, 3, 5, 7)
 version of his program.  Leo used the unobfuscated version, with the
 previously mentioned limitation to fix the 10000000001 bug which
 may be found in <A HREF="1992/albert/albert.fix.c">albert.fix.c</A>.
-For more details see Leo's <A HREF="1992/albert/albert.fix.hint">EMail</A> message.
+For more details see Leo's <A HREF="1992/albert/albert.fix.hint.md">EMail</A> message.
 </UL>
 <A NAME="1992_ant"></A>
 <P><B>ant</B> - make utility</P>