convert spoiler language and towards deobfuscation language

2013/endoh3/README.md

@@ -181,7 +181,7 @@ For the same reason, do not post a score that contains only `z1092`.
 You know, it is ["the famous song"](http://en.wikipedia.org/wiki/4%E2%80%B233%E2%80%B3).
 
 
-### Spoiler
+### Deobfuscation
 
 Here is a magical expression which I found by brute-force:
 

2013/endoh3/index.html

@@ -516,7 +516,7 @@ such as <code>C2E2</code>.</p>
 But I do not attach it to protect you from W****r.</p>
 <p>For the same reason, do not post a score that contains only <code>z1092</code>.
 You know, it is <a href="http://en.wikipedia.org/wiki/4%E2%80%B233%E2%80%B3">“the famous song”</a>.</p>
-<h3 id="spoiler">Spoiler</h3>
+<h3 id="deobfuscation">Deobfuscation</h3>
 <p>Here is a magical expression which I found by brute-force:</p>
 <pre><code>    (c % 32 + 5) * 9 / 5 % 13 + n / 32 * 12 - 22</code></pre>
 <p>Interestingly, it converts an ASCII number of ABC notes