convert more spoiler into deobfuscation

2015/index.html

@@ -418,7 +418,7 @@ and look at the source code again.</p>
 one of the all time best IOCCC entries from 1984.</p>
 <p>We also suggest that you take a very good look at how the
 <a href="muth/index.html">muth</a> code makes full use of the C Pre-Processor.</p>
-<p>…We’ll stop spouting spoilers now. Have fun exploring all the entries!</p>
+<p>…We’ll stop spouting deobfuscation information now. Have fun exploring all the entries!</p>
 <h2 id="remarks-on-some-of-submissions-that-did-not-win">Remarks on some of submissions that did not win</h2>
 <p>The number of entries that would have made it into the final rounds
 would have been much higher had some people paid attention to rules 2