convert spoiler language and towards deobfuscation language

2015/burton/README.md

@@ -227,7 +227,8 @@ This allows for a convenient test suite:
     PATH=. eprog < test.in | diff - test.out
 ```
 
-### Spoilers:
+
+### Deobfuscation:
 
 If you do not want to puzzle out how it works, see [spoilers.html](spoilers.html).
 

2015/burton/index.html

@@ -528,7 +528,7 @@ To stifle these complaints:</p>
 This allows for a convenient test suite:</p>
 <pre><code>    ln -sf prog eprog
     PATH=. eprog &lt; test.in | diff - test.out</code></pre>
-<h3 id="spoilers">Spoilers:</h3>
+<h3 id="deobfuscation">Deobfuscation:</h3>
 <p>If you do not want to puzzle out how it works, see <a href="spoilers.html">spoilers.html</a>.</p>
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